Nano Tank Plant Guide — 20 Best Plants for Small Tanks

Plants are the single biggest upgrade you can make to a nano tank. A 10 gallon with fish and no plants is a glass box of water you have to fight weekly to keep clean. The same 10 gallon planted heavily is a self-cleaning ecosystem that mostly manages itself. I have run both versions side by side in my fishroom for four years, and the planted tanks get half the water changes, a quarter of the algae, and roughly ten times the shrimp. This guide is the plant list I would hand a friend setting up their first planted nano, with the things that actually matter called out by name.

Why Plants Matter in Nano Tanks

Plants do three jobs in a nano tank, and the small water volume makes all three jobs more important than they are in a big tank. First, they pull ammonia, nitrite, and nitrate out of the water column directly — not just through the bacteria in your filter, but through their root systems and leaf tissue. In a 75 gallon this is a nice bonus on top of the biofilter. In a 10 gallon this is a meaningful second biofilter that absorbs the ammonia spike from one overfed cube of bloodworms before it kills your tetras.

Second, plants give shrimp and fish fry the structure they need to survive. A berried cherry shrimp in a bare 10 gallon drops her fry into open water where every fish in the tank picks them off. The same shrimp in a 10 gallon with Java moss, Anubias roots, and a floating Frogbit mat drops her fry into a thicket where most of them survive to adulthood. If you want to keep shrimp, plants are not optional — they are the difference between a colony that grows and a colony that holds steady or shrinks.

Third, plants compete with algae for the same nutrients — light, nitrogen, phosphate, trace iron. A planted tank with healthy growth has algae problems only when something is out of balance (too much light, not enough plants, dying plant mass rotting in the tank). An unplanted tank has algae problems constantly because nothing is competing for the niche. Most algae problems in nano tanks are not algae problems — they are plant problems disguised as algae problems. Fix the plants and the algae goes away on its own.

The 4 Plant Categories

Every plant in this guide fits one of four functional categories based on where it lives in the tank. Knowing the category matters more than knowing the species, because the category determines light, planting method, and care. Get the category right and the plant will thrive; get it wrong (a foreground plant stuck in the background, an epiphyte buried in the substrate) and the plant will die no matter how good your water is.

Foreground and carpet plants hug the substrate and spread horizontally. They want high light at the water line, which in a nano tank means they sit directly under the LED bar. Most carpet plants benefit from injected CO2 — the exception is Monte Carlo, which tolerates low-tech. Midground plants are 5–15 cm tall and form the visual middle layer. Most are slow-growing rosette plants (Cryptocoryne, Anubias nana) that fill in over months, not weeks.

Background plants are 20 cm or taller and go at the back of the tank. In a nano, that often means a single species like Vallisneria or a stem plant cluster. Epiphytes are the odd category — Anubias, Java fern, Bucephalandra, and the mosses. They attach to driftwood or rock and pull nutrients from the water column, not the substrate. You can glue them, tie them, or wedge them into crevices. They are also the lowest-maintenance plants in the hobby, which is why they show up in every list I write.

The 20 Best Nano Tank Plants

This is the list. Twenty species I have grown in tanks from 5 to 20 gallons, organised by where they go in the tank. Prices are what I pay at my local fish store or online — your numbers will vary. Each entry has the planting method, the light requirement, and the one thing most likely to kill it. Use this as a shopping list, not a wish list.

Foreground & Carpet Plants

Dwarf Hairgrass (Eleocharis parvula) — The classic lawn plant. Thin green blades 5–8 cm tall that spread by runners across the substrate. Plant in small clumps 2–3 cm apart and wait 6–8 weeks for them to fill in. Wants high light and benefits from CO2; without CO2 it grows slowly and patchy. Plant in sand or fine gravel, not soil cap — the runners need to anchor. Trim to 4 cm every two weeks to force lateral growth. The number-one killer is burying the crown (where the leaves meet the roots) — leave it just above the substrate.

Monte Carlo (Micranthemum tweediei) — The low-tech carpet plant. Round green leaves the size of a match head on creeping stems that hug the substrate. Spreads faster than Hairgrass, tolerates stock lighting, and does not demand CO2. Plant in small clumps 3 cm apart. Trim weekly once established or it piles up on itself and the lower layers rot. The number-one killer is insufficient light during establishment — the first three weeks need full intensity or the runners stall.

Dwarf Sagittaria (Sagittaria subulatta) — The hardy grass alternative. Looks like a smaller, softer version of Vallisneria, 8–15 cm tall. Not a true carpet — more of a low meadow — but it fills the same role and is nearly indestructible. Will grow in low light, no CO2, sand or gravel, hard or soft water. The number-one killer is being trimmed too aggressively — let it establish for 8 weeks before you cut it back.

Midground Plants

Cryptocoryne parva — The smallest Crypt, 5–8 cm tall. Slow-growing rosette that forms a tidy clump over six months. Plant in sand or soil cap, 5 cm apart, and let it alone. Wants low to medium light — too much light and algae grows on the leaves. The number-one killer is being moved — Crypts hate transplanting and will melt all their leaves in protest. Plant once and wait.

Cryptocoryne wendtii — The default Crypt. Comes in brown, green, red, and “tropica” forms. Grows 10–20 cm tall — technically a background plant in a 5 gallon, midground in a 20. Bulletproof in low light, no CO2, almost any water. The number-one killer is the melt phase — see The First 30 Days below. Plant it, leave it, accept the melt, and it will come back thicker than before.

Anubias nana — The bulletproof epiphyte that lives in the midground. Round dark green leaves on a thick rhizome. Attach to driftwood or rock with cyanoacrylate gel (superglue gel) or cotton thread. Grows slowly — one new leaf every 2–3 weeks. Tolerates any light, any water, any temperature from 22–28°C. The number-one killer is buried rhizome — see Planting Tips. Also vulnerable to algae on the leaves if light is too high; shade it under taller plants if you need to.

Bucephalandra — The premium Anubias alternative. Same care, same epiphyte planting method, but more colour — leaves range from deep green to blue-grey to almost purple, often with iridescent speckles. Slower than Anubias and more expensive ($15–$30 per piece vs $8 for Anubias nana). The number-one killer is being sold as “low light” when it actually wants medium light — too low and it sits there looking sad for months.

Java Fern (Microsorum pteropus) — The other bulletproof epiphyte. Long strap-like leaves from a rhizome, 15–25 cm tall. Small variants (“Trident”, “Petite”) fit better in nanos than the standard form. Attach to wood or rock — never bury the rhizome. Grows in any light, any water, no CO2. The number-one killer is the rhizome being planted in substrate, but a close second is black spots on the leaves from being kept too warm (above 28°C) — Java fern prefers 22–26°C.

Background Plants

Vallisneria nana — The thin-leaved background grass. Grows 30–60 cm tall, single thin green blades that sway in the current. Plant in sand or soil cap, 5 cm apart, and let it send out runners to fill the back wall. Tolerates hard water and high pH — the right plant if your tap is liquid rock and you want a planted tank. The number-one killer is being planted in soft acidic water — Vallisneria melts at pH below 6.5.

Rotala rotundifolia — The classic red stem plant. Grows 20–40 cm tall, leaves go pink-to-red under high light and iron. Needs medium to high light to stay red — in low light it stays green and lanky. Plant stems 2–3 cm apart in sand or soil. Trim and replant the tops regularly to keep a bushy shape. The number-one killer is being planted too sparsely — plant 10 stems minimum or it looks like a few sticks in the back.

Ludwigia repens — The other red stem plant. Easier than Rotala — grows faster, more forgiving of low light, leaves go red on the underside even in medium light. Plant 8–10 stems 3 cm apart and trim monthly. The number-one killer is being kept too warm — Ludwigia prefers 22–25°C and gets leggy above 27°C.

Pearl Weed (Hemianthus micranthemoides) — The most versatile plant in this guide. Tiny round green leaves on creeping stems. Planted flat in the substrate it becomes a carpet; planted upright it becomes a midground bush; floated in a clump it becomes shrimp cover. Grows fast in any light, no CO2 needed. The number-one killer is being trimmed too short — never cut more than a third of the height in one pass or the plant sulks for two weeks.

Epiphytes (attach to wood or rock)

Anubias — Already covered in the midground. The same species works as a wood-mounted epiphyte — in fact, this is the better way to grow them. Anubias barteri var. nana and Anubias barteri var. nana “Petite” are the two forms that fit in nanos.

Java Fern — Already covered. The single best epiphyte for driftwood in a nano tank — tie it to a manzanita branch and it looks like the branch has always had leaves.

Bucephalandra — Already covered. The premium option — more expensive than Anubias but the colour payoff is worth it on a feature piece of wood.

Christmas Moss (Vesicularia montagnei) — The moss for shrimp tanks. Tight branching growth that forms a deep green cushion. Glue small clumps to driftwood, lava rock, or a stainless mesh with cyanoacrylate gel. Shrimp live in it, breed in it, and graze on the micro-organisms it hosts. Wants low to medium light — too high and hair algae grows over it. The number-one killer is being kept in a tank with no flow — still water turns moss brown.

Flame Moss (Taxiphyllum sp.) — The vertical moss. Grows upward in twisting columns instead of spreading flat, which gives a totally different look on a feature rock or wood piece. Slower than Christmas moss but more dramatic. Same care: low light, glue to surface, decent flow. The number-one killer is being glued flat — it grows up, not out, so position the clump upright.

Floating Plants

Salvinia (Salvinia minima) — The tiny floating fern. Round leaves the size of a pencil eraser, hairy on top, with roots dangling into the water column. Multiplies fast — a handful becomes a full surface mat in three weeks. Shades the tank, pulls nitrate out of the water, gives shrimp somewhere to graze at the surface. The number-one killer is being kept in a tank with a strong HOB outlet — the splashing wets the leaves and they rot.

Frogbit (Limnobium laevigatum) — The larger floating plant. Round green leaves the size of a dime with long roots hanging 5–15 cm into the water. Looks like tiny lily pads from above. Slower than Salvinia but more substantial — better for tanks where you want a few floaters, not a full mat. The number-one killer is wet leaves from splashing — same as Salvinia, give it a calm corner.

Red Root Floater (Phyllanthus fluitans) — The show-off floating plant. Small round leaves that go red-to-pink under high light, with dark red roots hanging into the water. Wants calm surface, decent light, and low flow. Harder than Salvinia and Frogbit but worth it for the colour. The number-one killer is being kept green (insufficient light) — if your floaters are not turning red, the light is too weak.

Stem Plants (fast-growing, algae competitors)

Rotala rotundifolia — Already covered. The fastest-growing red plant in this guide. Pulls nitrate out of the water faster than any other plant here, which is why it shows up in every algae-fighting planting plan.

Ludwigia repens — Already covered. The second-fastest stem — slightly slower than Rotala but more forgiving of low light.

Pearl Weed — Already covered. The fastest-growing green plant in this guide. A 5 cm clump becomes a 20 cm bush in eight weeks in a low-tech 10 gallon. Trim weekly once established and compost the trimmings — you will have more than you can give away.

Easy vs Hard Plants — Quick Reference

Every plant in this guide falls somewhere on the easy-to-hard scale. The table below is the cheat sheet — if you are starting out, pick from the easy column only. The medium column is fine once you have kept a planted tank for six months. The hard column needs CO2 and is not for a first planted nano.

If you are setting up your first planted nano and you want a guaranteed win, buy two Anubias nana, two Java ferns, one pot of Cryptocoryne wendtii, one clump of Java moss, and a handful of Salvinia. That is $40 of plants that will live in any 10 gallon under any stock light with no fertiliser, no CO2, and no special care. Do that first; graduate to the medium and hard columns once you have kept those alive for six months.

Low-Tech vs High-Tech (CO2)

The single biggest decision in a planted nano is whether to inject CO2. The cost difference is real — a low-tech nano runs $35 in lights and $0 in CO2, a high-tech nano runs $130 in lights and $200+ in CO2 equipment — and the maintenance difference is bigger. A low-tech nano needs weekly water changes and monthly trims. A high-tech nano needs weekly trims, daily CO2 monitoring, fert dosing twice a week, and weekly water changes. The plant list is also different — many of the dramatic plants you see on aquascaping channels (HC Cuba carpets, bright red Rotala walls) simply do not exist in low-tech tanks.

You need CO2 if: you want a true carpet of Dwarf Hairgrass or HC Cuba; you want Rotala and Ludwigia to stay genuinely red, not just pink-underside; you are setting up an aquascape for competition or photos; you have the budget and time to maintain a high-tech tank. The reward is faster growth, more plant species available, and visual payoff that low-tech cannot match.

You do NOT need CO2 if: you are keeping shrimp and nano fish and want a planted tank for water quality and habitat; you are happy with Anubias, Java fern, Crypts, Vallisneria, Java moss, and the low-tech stems; you have a 5 or 10 gallon (CO2 is hardest to stabilise in small volumes); you are a beginner. 80% of planted nanos belong in this category and the people who push CO2 on beginners are usually selling CO2 systems.

The hybrid path is DIY yeast CO2 — a $15 kit with a sugar/yeast bottle and a diffuser. It works on a 20 gallon for about 3 weeks per bottle, then you refill. The catch is that the CO2 output declines as the yeast dies, so your tank gets a strong pulse and then a slow tail-off, which stresses plants. I do not recommend it for your first planted tank. If you want CO2, save up for a pressurised system ($200 for regulator + cylinder + diffuser) and do it properly on a 20 gallon or larger.

Planting Tips (Don’t Bury the Rhizome!)

Planting mistakes kill more nano plants than water parameters ever do. The single most common one is burying the rhizome on Anubias, Java fern, and Bucephalandra. The rhizome is the thick green horizontal stem that the leaves and roots grow from. It needs to be exposed to water flow — if you bury it in sand or gravel, it rots and the plant dies in 2–4 weeks. Plant epiphytes by gluing or tying them to a piece of driftwood or a rock, with the rhizome completely above the substrate. The roots will grow down into the substrate on their own.

For stem plants (Rotala, Ludwigia, Pearl Weed), plant the stems 2–3 cm deep in sand or soil cap. Strip the bottom 3 cm of leaves off the stem before planting — if you bury leaves, they rot and the stem rots with them. Plant stems in groups of 8–12, spaced 2 cm apart, for a bushy look from day one. Stem plants are the only plants where planting more is always better — a single stem looks sad and dies; a group of ten thrives.

For carpet plants (Dwarf Hairgrass, Monte Carlo), plant in small clumps of 5–7 blades, not individual stems. Use planting tweezers ($10 on Amazon) — trying to plant carpet plants with your fingers is a 30-minute chore that ends with the plants floating. Push the clump into the substrate until the crown (where leaves meet roots) is just above the sand. Plant clumps 3 cm apart in a grid pattern and let them fill in over 6–8 weeks.

For mosses, glue small clumps to the surface with cyanoacrylate gel (Gel Super Glue from the hardware store, $4 — it is the same thing as the $12 “aquarium” glue). Dot the glue on the wood, press the moss into it for 10 seconds, and move on. Within 4 weeks the moss grows over the glue and you cannot see it. Cotton thread also works but takes longer to disappear. Do not use rubber bands or zip ties — they never disappear and look terrible forever.

The First 30 Days (the Melt Phase)

Most plants sold in the hobby are grown emersed — out of water, in a humid greenhouse — because they grow faster and cheaper that way. When you submerge them, the emersed-grown leaves are not adapted to underwater life and they melt off. The plant is not dying — it is transitioning. New submerged-form leaves grow in from the centre of the plant over 2–6 weeks while the old leaves rot away. This is the melt phase, and it is the single most common reason new keepers rip out plants that were about to thrive.

Cryptocoryne are the worst for this. A newly planted Crypt wendtii will lose every leaf within 2 weeks. The keeper sees a pot of melted stumps, assumes the plant is dead, and pulls it. Two weeks later the roots would have pushed up a fresh set of submerged leaves and the plant would have grown back thicker than before. When you plant a Crypt, commit to leaving it alone for 6 weeks. If there is anything green left at all, the plant is alive.

Stem plants melt less but transition differently — the bottom leaves yellow and drop while the top keeps growing. Trim the melting bottom leaves off so they do not rot, and let the top grow. Within 4 weeks you have a clean stem with new submerged-form leaves. Anubias, Java fern, and Bucephalandra barely melt — they are slow growers that arrive already in submerged form most of the time. Mosses do not melt at all — if your moss is dying in the first 30 days, something else is wrong (usually light or flow).

The other first-30-days issue is algae. A newly planted tank has plants that are not yet taking up nutrients, and the algae takes the niche. This is normal and temporary. Do not panic, do not rip out the plants, do not dump algicide in the tank. Manually remove what you can, reduce the photoperiod to 6 hours, and wait for the plants to establish. By week 4 the plants are growing faster than the algae and the problem solves itself.

Common Plant Failures

1. Buried rhizome on Anubias, Java fern, or Bucephalandra. The plant looks fine for a week, then the leaves yellow and drop, then the rhizome turns to mush. There is no recovery — once the rhizome rots, the plant is dead. Pull it, smell it — if it smells like rotten eggs, it is gone. Next time, glue it to wood.

2. Insufficient light for the plant species. Dwarf Hairgrass under a 5-watt kit light sits there for 6 weeks doing nothing, then melts. Rotala rotundifolia under low light grows straight up and stays green. Match the plant to the light — the easy column in the table above will grow under any stock light; the hard column will not.

3. Planting too sparse. Six plants in a 10 gallon with 80% open substrate is an algae farm waiting to happen. Pack the plants in — aim for 70% substrate coverage on day one. Trim back later. A planted nano should look over-planted when you finish.

4. Pulling plants during the melt phase. Already covered — the plant is not dead, it is transitioning. Leave it alone for 6 weeks before you make any decisions.

5. Too much light, too long. Eight hours of light is the upper limit for a low-tech nano. Ten hours guarantees algae. Put the light on a timer ($8) at 6 hours for the first month, then bump to 7. Never run a planted nano light 12 hours a day — you will regret it.

6. Using plant fertiliser in a low-tech tank. Low-tech plants get everything they need from fish waste and tap water. Adding liquid fertiliser to a low-tech nano feeds algae, not plants. Save the ferts for high-tech CO2 tanks where plant growth is fast enough to actually use the nutrients.

Frequently Asked Questions