The Nano Shrimp Hub

Nano shrimp are the only livestock in the hobby that give you a self-sustaining colony, a clean-up crew, and a striking display animal in a 5 gallon tank on your desk. I have kept cherry shrimp continuously since 2021, added a Caridina tank in 2023, and watched the shrimp side of my fishroom quietly outperform the fish side on every metric that matters — bioload, visual interest, and dollars per hour of enjoyment. This hub is the entry point for everything nano shrimp on Tank Logic. Read it once, then dive into the species pages linked at the bottom.

Why Nano Shrimp?

Shrimp are the only freshwater livestock that genuinely thrive in tanks too small for fish. A 5 gallon tank that would be a fish welfare problem is a perfect shrimp colony tank, and a 10 gallon is a palace. The bioload is tiny — a single adult cherry shrimp produces maybe a tenth the ammonia of a single neon tetra — so your filtration needs are modest and your water change schedule is forgiving. You can run a shrimp-only 5 gallon with a small sponge filter and 20% water changes every two weeks without breaking a sweat.

The behaviour is what hooks people. A colony of 30 cherry shrimp in a planted 5 gallon is more interesting to watch than most fish tanks twice the size. You see them foraging constantly, molting in the open, carrying eggs under their swimmerets, and the tiny perfect replicas of the adults appearing two to three weeks after you spotted the berries. The lifecycle plays out in front of you on a three-week loop. It is genuinely hard to walk past the tank without stopping.

They are also a working animal. Shrimp graze algae, biofilm, and detritus that fish ignore — the soft green fuzz on driftwood, the diatom dust on the substrate, the leftover flake that fell behind a rock. They are not a substitute for cleaning, but they are a meaningful part of a balanced clean-up crew. In my planted tanks the shrimp-only corners stay visibly cleaner than the shrimp-free corners, and that is not a small thing.

The 5 Best Nano Shrimp

There are dozens of shrimp species in the hobby, but five account for almost everything a normal aquarist will keep. Each fills a different niche — some are colour variants of the same genus, some are completely different animals with completely different care. Here is the snapshot:

Cherry shrimp (Neocaridina davidi, red strain) are the gateway shrimp. They are nearly bulletproof in tap water that is not liquid rock, they breed freely, and a starter colony of 10 will be 50 in six months. They are the species I recommend to every first-time shrimp keeper without reservation. They come in red (cherry), yellow, orange, green, blue, black, white, and rili (clear midsection) — all the same species, just different selective breeding lines. The full care sheet is on the Blue Pearl shrimp page (the blue strain — the care is identical to red cherry shrimp, the colour is the only difference).

Blue Pearl shrimp deserve their own mention because they are not just a colour variant — they are the line that convinced me shrimp could be a display animal, not just a clean-up crew. A colony of 30 blue pearls in a black-background 5 gallon, under warm LED light, glows like polished lapis. The care is identical to cherry shrimp (they are the same species, just selectively bred blue). The full species profile with parameters, grading, and breeding notes is here.

Amano shrimp (Caridina multidentata) are the algae-workhorses of the hobby. They are larger (4–5 cm), almost transparent, and they eat hair algae and staghorn algae that cherry shrimp will not touch. They will not breed in freshwater — the larvae need brackish water to metamorphose — so a colony of 5 in a 10 gallon stays at 5 forever, which is exactly what some people want. They are also the most active swimmer of the group; I have watched mine dash across a 20 gallon at lightspeed to grab a wafer, which is not behaviour you get from cherry shrimp.

Crystal Red shrimp (Caridina logemanni) and the broader Caridina family — Crystal Black, Tibee, King Kong, Pinto, Tiger — are the high-end of the hobby. They want active substrate (Amazonia, Fluval Shrimp Stratum), RO water remineralised to GH 4–6, pH 5.8–6.8, and a temperature that holds 22–24°C without drift. They are stunning and the grading system (C, B, A, S, SS, SSS) is a hobby unto itself. They are also unforgiving — a parameter swing that a cherry shrimp shrugs off will kill a crystal red overnight. Keep these only after you have kept Neocaridina successfully for at least a year.

Bamboo shrimp (Atyopsis moluccensis) and the related vampire shrimp (A. gyldenstolpei) are filter-feeders, not grazers. They sit in the current with their fan-arms open and strain particles from the water column. They are big (5–8 cm), they need a tank with real flow (a powerhead, not just a sponge filter), and they need a feeding routine — powdered shrimp food, crushed flake, or commercial phytoplankton dusted into the current. They are peaceful, they are visible, and they are the closest thing the shrimp hobby has to a "pet" shrimp. Vampire shrimp are a deep-water West African variant that hides more during the day; bamboo shrimp are out in the open almost constantly.

Tank Setup

The minimum for a shrimp-only tank is 5 gallons. That is not a marketing number — it is the smallest volume that holds parameter stability when the colony starts breeding up. A 2.5 gallon shrimp tank works for two months and then crashes when the population doubles, because the biofilter cannot keep up with the swing and you cannot keep the water changed aggressively enough to compensate. A 5 gallon gives you the buffer. A 10 gallon is the sweet spot — enough water volume to absorb parameter swings, enough floor space for a meaningful colony of 50+ shrimp, and small enough to fit anywhere.

The hardware is simple. A sponge filter is the right choice — it cannot suck up shrimp babies the way a hang-on-back can, and the sponge itself becomes a buffet surface for the shrimp to graze. Run an air pump rated for the tank size; you do not need a canister. A heater is optional for Neocaridina if your room stays above 18°C, and mandatory for Caridina (set to 23°C) and bamboo shrimp (set to 26°C). Substrate for Neocaridina is anything inert — sand, gravel, or bare bottom all work. For Caridina you need active soil (Amazonia or Fluval Shrimp Stratum) to hold the pH down; inert substrate will not do it.

Plants are non-negotiable. Shrimp need surfaces to graze — biofilm grows on plant leaves, mosses, driftwood, and the sponge filter. A shrimp tank without plants is a shrimp tank that needs constant feeding, and constant feeding is what causes parameter crashes. I would put Java moss, subwassertang, Anubias nana, and a float of Salvinia or frogbit in every shrimp tank I set up. Mosses especially — baby shrimp hide in moss the way tetra fry hide in plants, and a mossball or moss wall will dramatically increase your survival rate of new shrimp babies.

One piece of equipment that is not optional: a pre-filter sponge on any intake. If you run a hang-on-back or canister, the intake tube will suck up shrimp babies. A 99-cent foam pre-filter on the intake fixes this completely. I lost an entire cohort of baby blue pearls to an unfiltered Aquaclear intake in my first year — do not make my mistake.

Water Parameters: Cherry vs Caridina

The single biggest decision in the shrimp hobby is which genus to keep, and the decision is made by your tap water. Neocaridina (cherry, blue pearl, rili, yellow, orange) want harder, alkaline water. Caridina (crystal red, bee, tiger, tibee, king kong) want softer, acidic water with active soil. You can keep both genera alive in compromised water, but they will not breed, they will not colour up, and they will die young. Match the genus to the tap. Always.

Neocaridina parameters: pH 6.8–8.0, GH 8–15 dGH, KH 3–8 dKH, temperature 18–27°C. Most North American and European tap water is in this range out of the faucet. Test your tap — if pH is 7.0–7.8 and GH is 8–12, you can keep Neocaridina with zero water modification. If your tap is very soft (pH 6.5, GH 3), add a small bag of crushed coral or a piece of cuttlebone to the filter to bring the GH up; cherries need the calcium for molting. Avoid extreme heat — anything above 28°C long-term shortens their lifespan from 18–24 months down to 8–12.

Caridina parameters: pH 5.8–6.8, GH 4–6 dGH, KH 0–2 dKH, temperature 22–24°C. This is not tap water anywhere I have lived. You will need RO water remineralised with a Caridina-specific salt (Salty Shrimp Bee Mineral GH+ is the standard), active substrate (Amazonia or Shrimp Stratum), and a stable heater. The substrate will hold pH down for 12–18 months before it exhausts — budget for replacement. Temperature control matters more than anything; a swing from 22°C to 26°C in a day can wipe a crystal red colony.

Ammonia, nitrite, nitrate: the same rules apply to both genera, but the tolerances are not. Cherry shrimp tolerate trace nitrate up to 20–40 ppm without obvious harm. Caridina want nitrate under 10 ppm, ideally under 5. Both genera will die from ammonia or nitrite at any readable level — shrimp are not fish, they do not have the buffer of haemoglobin, and 0.25 ppm ammonia is a shrimp-killer. Cycle the tank fully before adding shrimp, and use a liquid test kit (API or Sera), not strips.

Grading & Color Forms

Shrimp grading is a hobby inside the hobby, and it is the part that hooks people who started with "just a clean-up crew." Both Neocaridina and Caridina have grading systems that describe the colour intensity and pattern, and high-grade shrimp sell for genuinely silly money — SSS+ crystal reds can hit $50–100 each, and certain king kong and pintos can clear $200 from the right breeder.

For Neocaridina, grading is simpler. The colour strains are the variety — red (cherry), yellow, orange, green, blue (blue pearl), black rose, white (snowball), rili (coloured head/tail, clear middle), and carbon rili (black head/tail, clear middle). Within each strain, "higher grade" means more opaque, more uniform colour, with no clear patches on the body. A low-grade cherry is patchy red with transparent edges; a high-grade cherry is solid, opaque, fire-engine red from head to tail. The way you grade up is culling — remove the lowest-colour shrimp from the breeding pool every generation and the colour intensifies over a year or two.

For Caridina (crystal red, crystal black, and the bee/tibee/pinto derivatives), grading is by the white band width and solidity. The scale runs C (low), B, A, S, SS, SSS, with "+" modifiers at the top. A C-grade crystal red has thin broken white bands and lots of red. An SSS+ has thick, opaque, snow-white bands with minimal red, and the red is deep crimson. The grading is judged on band width, band solidity, colour intensity, and the pattern symmetry. Mosura (a face-only red pattern), flower (red spots on white), and zebra (striped) are recognised pattern grades worth more than the base colour grades.

The practical advice for new keepers: ignore the grading system for your first colony. Buy 10–15 low- or mid-grade cherry shrimp (or blue pearls), let them breed, and cull the bottom 20% to a separate tank every few months. You will see the colour improve in real time, you will learn what "grade" actually looks like in your water, and the colony will be far more resilient than imported high-grade stock. High-grade imported shrimp are fragile — they have been line-bred for colour at the expense of hardiness, and a colony crash on imported S-grade crystal reds is a rite of passage that you do not need to go through in your first year.

Breeding

Breeding Neocaridina is so easy it is harder to stop than to start. Adult females berried (carrying eggs under the abdomen) at 3–4 months old, eggs hatch in 25–35 days depending on temperature, and the babies are perfect miniature adults — no larval stage, no special food, no brackish water. A single female produces 20–30 offspring per clutch, and the colony doubles every 6–10 weeks in good conditions. The first time you spot a berried female in your own tank is a small thrill; by the tenth time it is just a Tuesday.

The keys to a breeding Neocaridina colony are stable parameters, enough food, and enough cover. Stability means no big swings in temperature, pH, or GH — every water change should match the tank parameters within a few degrees and a few tenths of a pH. Food means a mix of biofilm (the moss and the sponge filter), commercial shrimp food (Bacter AE, Shrimp King, or generic shrimp pellets), and the occasional blanched spinach or zucchini slice. Cover means moss — baby shrimp hide in moss for the first week while they are too small to defend themselves, and tanks without moss have noticeably lower baby survival.

Breeding Caridina is a different sport. The same mechanics apply — berried females, 25–35 day hatch, miniature adults — but the parameter tolerances are tight enough that a single bad water change can wipe a berried female's egg clutch or cause her to drop the eggs entirely. Caridina keepers remineralise RO water in batches, test every parameter every week, and treat temperature like a religion. The reward is that a successful Caridina colony is one of the most visually striking things in freshwater aquaria — a tank of SSS crystal reds against dark substrate under warm light looks like jewellery.

Amano shrimp are the odd ones out. They breed readily in freshwater — you will see berried females constantly — but the eggs hatch into a larval stage that requires brackish water (specific gravity 1.008–1.012) to metamorphose into juvenile shrimp. Raising amano larvae is a project that involves a separate brackish tank, live phytoplankton or commercial larval food, and a 30-day metamorphosis window where the larvae morph into miniature adults and immediately need to be moved back to freshwater. It is doable, it is rewarding, and it is well beyond the scope of a beginner guide. Most amano keepers simply buy new adults every few years as the old ones die of old age.

Tank Mates: Fish That Will Not Eat Them

The honest answer to "what fish can I keep with shrimp" is: none, if you want a self-sustaining colony. Anything with a mouth big enough to fit a baby shrimp will eat baby shrimp. That includes fish sold as "community safe" and "shrimp safe" — tetras, guppies, endlers, dwarf gouramis, small barbs, even otocinclus have been filmed picking off baby shrimp on occasion. The question is not "will they eat shrimp" but "will they eat enough shrimp to wipe out the colony."

The fish I trust around a breeding shrimp colony, in rough order of safety: Otocinclus (genuinely safe, they eat algae and ignore shrimp); pygmy corydoras (C. hastatus, C. pygmaeus, C. habrosus — they school mid-water and do not bother the substrate the way larger corydoras do); Boraras brigittae and other micro rasboras (mouth too small for even baby shrimp); celestial pearl danios (mostly safe, will pick off a few babies but the colony outpaces them); and kuhli loaches (nocturnal, mostly ignore shrimp). That is the list. Anything else, you are trading colony growth for fish variety.

If you must keep fish with shrimp, the strategy is dense cover. A moss wall, a deep subwassertang clump, a stack of cholla wood, leaf litter — these give the babies a refuge from predation. The colony will still lose babies, but enough will survive to keep the population stable. I have run cherry shrimp with ember tetras in a 20 gallon long for two years; the colony grows, but slowly — maybe half the rate of my shrimp-only 10 gallon next to it. That is the tradeoff, and you should know it going in.

The fish I absolutely do not trust with shrimp, no matter what the store told you: any cichlid (yes, even rams and apistos — they are shrimp-hunters by nature), any betta (some individuals ignore shrimp, most hunt them, and you find out which kind you have when your colony disappears overnight), any gourami, any loach that is not a kuhli, any goldfish, and anything with "shark" or "barb" in the name. Treat the shrimp-only tank as the default and the fish-and-shrimp tank as the exception that requires careful planning.

Common Mistakes

1. Adding shrimp to an uncycled tank. Shrimp are more sensitive to ammonia and nitrite than fish, and a tank that is "almost cycled" will kill them. Cycle the tank fully — 0 ammonia, 0 nitrite, measurable nitrate, on a liquid test kit — before adding shrimp. A tank that has been running fishless for two weeks is not cycled. Use the cycling guide and do it properly.

2. Using copper-based medications or fertilisers. Copper is lethal to shrimp at concentrations that are therapeutic for fish. Most general fish medications (Ich-X, general cure, etc.) contain copper. Most liquid plant fertilisers do not — but check the label every time, because formulations change. The single most common way shrimp keepers wipe a colony is by dosing a copper-containing med to treat ich on a tank mate.

3. Big water changes with mismatched water. A 50% water change with water 4°C colder and 1.5 pH points different from the tank will trigger a molt crash. Shrimp molt in response to parameter shifts, and a forced mass-molt when the shrimp are not ready kills them. Match the new water to the tank within 1°C and 0.3 pH. Do 20–30% changes weekly, not 50% changes monthly.

4. Over-cleaning the filter. The sponge filter is the shrimp's second buffet. Squeezing it clean under tap water wipes the biofilm and the bacteria. Squeeze it gently in old tank water during a water change — never under tap, never to "clean" — and leave it brown. A brown sponge filter is a healthy sponge filter.

5. Mixing Neocaridina colour strains in the same tank. All Neocaridina davidi colour variants are the same species and they will interbreed. The offspring of a red cherry and a blue pearl is a brownish-grey wild-type shrimp — you lose both colours in one generation. Keep one colour per tank, or accept that within a year you will have a tank of brown shrimp.

6. Buying high-grade Caridina as your first shrimp. High-grade crystal reds and king kongs are fragile, expensive, and unforgiving of beginner mistakes. Cut your teeth on a $25 colony of low-grade cherry shrimp for a year, learn the rhythm of water changes and feeding, then move up. The $200 shrimp will still be there when you are ready.

Species Guides & Tools

Use the stocking calculator to check bioload before adding fish to a shrimp tank. For the species-specific pages and related guides, start here:

• Blue Pearl Shrimp Care Sheet — full Neocaridina davidi blue strain profile, parameters, grading, breeding
• Cycling Your Tank — non-negotiable before shrimp go in
• Water Parameters Guide — pH, GH, KH explained for shrimp keepers
• Tank Size Calculator — verify the actual water volume of your shrimp tank
• Fish Database — check shrimp-safe species before you buy

Frequently Asked Questions