Photographing nano fish is the most frustrating thing in the hobby until it suddenly is not. The first fifty photos you take will be blurry, washed-out, or empty — the fish was there a second ago, the camera focused on the glass instead. Then one afternoon you do four things differently and you get a shot that looks like it belongs in a magazine. This guide is the four things, plus the patience and the post-processing that turn a lucky shot into a reliable process. Everything here works with any camera, including the phone in your pocket. I shoot 90% of my fishroom photos on an iPhone 13 with a cheap clip-on macro lens, and the rest on a Sony a6400 with a 90mm macro. The phone gets the keepers about a third of the time.
Take 100 shots, keep 1. The keeper rate for nano fish is roughly 1% — meaning for every sharp, well-composed photo you publish, expect to delete 99. Burst mode is your friend: hold the shutter for 2–3 seconds and you get 20–40 frames to choose from. The fish will move, blink, turn, and hide between most of them, but one frame will catch them in the right pose at the right angle. Patience is the camera. The camera is just the tool that records what patience finds.
Why Nano Fish Are Hard to Photograph
Three reasons, in order of importance. First, they are small — a chili rasbora is 2 cm long, a celestial pearl danio is 2.5 cm, a neon tetra is 3 cm. To fill a third of the frame with a 2 cm fish, you need either close focus (macro) or heavy cropping. Both reduce image quality, and the second reduces it a lot. Second, they move constantly. A tetra in motion covers 5–10 body lengths per second, which means it crosses a typical phone camera frame in under a second. The shutter speed required to freeze that motion is 1/500 second or faster, which most phone cameras cannot deliver in low light without ISO noise ruining the shot.
Third, they are behind glass. The glass introduces three problems of its own: reflections (your face, the room, the light), focus errors (the camera locks on the glass instead of the fish), and distortion (cheap aquarium glass is not optically flat and slightly blurs whatever is behind it). The reflections are solved by controlling the room lighting. The focus errors are solved by tapping on the fish before each shot. The distortion is solved by getting close and shooting perpendicular to the glass — never at an angle, which exaggerates the distortion.
The combination of these three is why "I will just snap a quick photo" produces nothing usable 95% of the time. The 5% that work are accidents. The point of this guide is to make the working percentage higher and to make it reproducible — you should be able to set up the tank, set up the light, and get a keeper within 20 minutes whenever you want, not just when the stars align.
The Camera — Phone vs DSLR vs Mirrorless
The phone is enough. A modern phone — iPhone 12 or later, Samsung Galaxy S20 or later, any Google Pixel — has a camera that, in the hands of someone who has read this guide, will produce photos indistinguishable from a $2000 DSLR setup for web display and most social media. The phone's advantages are burst mode (shoot 20 frames in a second by holding the shutter), tap-to-focus, computational exposure handling, and always being in your pocket. The phone's disadvantages are no optical zoom (use the 1x lens, crop in post) and limited low-light performance (solved by adding light, see below).
A DSLR or mirrorless with a 100mm macro lens is the upgrade. The Sony 90mm macro, the Canon 100mm macro, the Nikon 105mm macro — any of these on a current mirrorless body (Sony a6400/a6700, Canon R7, Nikon Z50) gives you working distance, magnification, and shallow depth of field that a phone cannot match. A 100mm macro lets you fill the frame with a 2 cm fish from 30 cm away, which is enough distance that the fish is not spooked. The same shot on a phone requires you to be 5 cm from the glass, which the fish will not tolerate. If you are serious about nano fish photography, the macro lens is worth the money. If you are casually documenting your tank, the phone is fine.
The middle ground — a point-and-shoot or a bridge camera — is the worst option. They cost as much as a used mirrorless body, have smaller sensors than a phone, and lack the interchangeable lenses that make either a phone or a mirrorless useful. Skip them. The clip-on phone lenses (moment, apexel) are also mostly junk — the wide-angle ones distort, the macro ones have soft corners, and none of them are sharp enough to be worth the $30–$100. The phone's built-in 1x lens is sharper than any clip-on.
Tank Preparation — Clean Glass, Dark Room
Before you take a single photo, clean the glass. Inside and out, with a magnetic algae scraper or a clean microfibre cloth. Any algae film, fingerprint, or water spot on the inside of the glass will show up in every photo and ruin focus. Spend 5 minutes on this — it is the highest-leverage 5 minutes of the whole process. After cleaning, wait 15 minutes for the fish to settle down from the scraping activity; a fish that has been chased around by an algae magnet is not going to pose nicely.
Darken the room. The biggest source of unwanted reflections on the glass is the room behind the photographer. Turn off the room lights, close the curtains, and shoot with only the tank light and your single side light on. A dark room means your face is not reflected in the glass, the wall behind you is not reflected, and the only thing the camera sees through the glass is the fish. If you cannot darken the room fully, wear a dark shirt and stand as close to the tank as possible — the closer you are, the smaller your reflection is in the glass relative to the fish.
Wipe down the outside of the front glass with a clean dry microfibre cloth right before shooting. Even in a dark room, dust settles on the glass and shows up as soft white dots in photos. The cloth takes 10 seconds and saves you from cloning out dust spots in post for 20 minutes. If you have a canopy top, take it off — the top edge of the glass often collects condensation that drips down mid-shoot and ruins a series of frames.
Lighting — Side Light at 45 Degrees, Never Flash
Lighting is the second most important variable after glass cleanliness, and the rule is simple: use a single side light at 45 degrees from the front face of the tank, never the on-camera flash. The flash produces glare on the glass, washes out fish colour, and stresses the fish. A desk lamp with a daylight-balanced LED bulb (5000–6500K, $8 at the hardware store) pointed at the side of the tank from a 45-degree angle gives you even, natural-looking light that brings out fish colour without reflections on the glass.
The tank's own light is not enough on its own. Most aquarium lights are mounted above the tank and point straight down, which produces top lighting. Top lighting on a fish creates shadows under the body and flattens the colour — the fish looks washed out and featureless. The side light fills in those shadows and reveals the colour and detail of the side of the fish, which is the part you are photographing. Position the desk lamp to the left or right of the tank, aimed at the front 6–8 inches of water where the fish are most likely to swim. Move the lamp closer or farther to tune the intensity — you want the fish well-lit but not blown out.
Avoid direct sunlight entirely. A sunbeam through the window onto the tank produces harsh, contrasty light with hard shadows and reflects off every ripple in the water. Indirect window light (the tank near a window but not in the sunbeam) is genuinely good — it is diffuse, daylight-balanced, and free — but only available for the 3–4 hours a day when the window is in the right position. If you have a north-facing window (in the northern hemisphere), the indirect light is consistent all day. Otherwise, the desk lamp is the reliable answer.
Settings — Burst Mode, Tap to Focus, Lock Exposure
On a phone: open the camera app, switch to photo mode (not portrait mode — portrait mode applies fake bokeh that looks terrible on fish), tap on the fish to set focus, hold your finger on the fish for 2 seconds to lock focus and exposure (AE/AF lock on iPhone, similar gesture on Android), then hold the shutter button to shoot a burst of 20–40 frames. The AE/AF lock is critical — without it, the phone will refocus on the glass or re-expose for the background every time the fish moves, and every shot will be slightly off. With the lock, the focus and exposure stay where you set them, and the burst gives you a sequence to choose from.
On a DSLR or mirrorless: shoot in aperture priority (A or Av mode), set the aperture to f/8–f/11 for a depth of field that keeps the whole fish in focus, set the ISO to 800–1600 (or higher if your camera handles it cleanly), and let the shutter speed float — you want 1/500 or faster, which the camera will hit if the light is bright enough. Switch to continuous autofocus (AF-C / AI Servo) and burst mode (high). Hold the shutter half-pressed to track the fish, then fully pressed to shoot a burst of 10–20 frames. Manual focus is a valid alternative for fish that hover in one spot — pre-focus on a spot you know the fish will visit, then shoot when they arrive.
The single setting that ruins the most fish photos is autofocus hunting. The camera tries to focus, the fish moves, the camera refocuses, the fish moves again, and you get a burst of perfectly-focused empty water. The fix is to predict where the fish will be and pre-focus there. Bettas return to the same spot in the tank every 30 seconds; tetras circle the tank in a predictable pattern; shrimp stop on the same piece of moss repeatedly. Watch the fish for 5 minutes before shooting, identify the pattern, and pre-focus on the spot. When the fish arrives, fire the burst.
Composition — Rule of Thirds, Eye Level, Wait for the Frame
Composition is the difference between a sharp photo of a fish and a photo that makes someone say "wow." The basics: rule of thirds (put the fish's eye on one of the four intersection points of a 3x3 grid over the frame, not in the centre), get at eye level with the fish (for most nano fish this means the camera is at the bottom third of the tank, not at the top), and leave space in front of the fish for it to "swim into" — the fish should be facing into the open part of the frame, not the edge.
Eye level is the most important and the most violated. A photo of a fish taken from above — standing over the tank, looking down — shows the back of the fish, which is the least interesting angle. A photo taken from the front, at eye level, shows the side of the fish with the eye, the fin, and the colour visible. For a 10 gallon tank on a stand, "eye level" means sitting on the floor or kneeling. For a 20 gallon on a low stand, it means standing normally. Get the camera lens at the same height as the fish, not the same height as your face.
Wait for the frame. Do not chase the fish around the tank with the camera — you will end up with motion-blurred frames of fish tails disappearing out of shot. Instead, pick a composition — a piece of driftwood on the left, a plant on the right, an open lane of water in the middle — and wait for a fish to swim into it. The fish decides when the photo happens, not you. Patience is the camera; the camera is just recording what patience finds. A 20-minute wait for a single tetra to swim through the perfect spot is normal, and the resulting photo is 10x better than the 50 frames you would have gotten chasing the school around.
Patience — Take 100 Shots, Keep 1
The keeper rate for nano fish is roughly 1%. That is not a typo. For every sharp, well-composed photo you publish, you will delete 99. This is normal. The advantage of digital is that the deleted 99 cost nothing — no film, no developing, no penalty for trying again. The instinct that says "I got a couple of good ones, let me stop" is wrong; the instinct that says "I will shoot until I have 200 frames and pick the best one" is right. The math: 200 frames at a 1% keeper rate gives you 2 good photos. 20 frames at a 1% keeper rate gives you 0 good photos.
Shoot in sessions of 20–30 minutes. Less than that and you have not given the fish time to settle into the routine that produces good photos. More than that and the fish start to stress from the constant presence of the camera and the side light, and they hide. A 30-minute session once a week produces more keepers over a year than a 3-hour session once a month. The fish learn that the camera is not a threat, the photographer learns the fish's patterns, and the cumulative keeper count goes up.
The other part of patience is editing the take honestly. After a 200-frame session, dump all the photos into a folder, view them at 100% zoom, and flag the sharp ones. You will have 3–10 sharp frames out of 200. Of those, 1–3 will have the fish in a good pose, the right composition, and the right expression (yes, fish have expressions — a flared betta vs a calm betta vs a stressed betta are three different photos). Delete the rest. The 1–3 keepers are the session's output. Anything you keep "in case I need it" will sit on your hard drive forever and you will never look at it again.
Specific Tips by Species
Shrimp. Wait until they are grazing. A shrimp in motion — walking, swimming, climbing — is nearly impossible to photograph sharply because their legs move fast and the camera locks focus on the wrong leg. A shrimp stopped on a piece of moss or wood, picking at biofilm, is stationary for 5–15 seconds at a time, which is plenty. Get at eye level with the shrimp (usually the bottom third of the tank), tap to focus on the eye, and shoot a burst of 10–20 frames. Cherry shrimp colour pops best against green plants — place them in front of Java moss or Anubias for the contrast. Crystal reds and tibees photograph best on dark substrate, which makes the white pop.
Bettas. Wait for a flare. A betta in repose is a pretty fish; a betta flaring is a striking photo. The flare happens when the betta sees another betta (use a small mirror held against the glass for 5 seconds, then remove it) or when they are fed and excited. The full flare — gills out, fins spread — lasts 2–5 seconds, so have the burst already running. Do not flare the betta for more than 30 seconds total per session — the stress is real and the betta will sulk for hours. Photograph the flare, then leave the fish alone. A flared betta shot from directly in front (the "face-on" view) is one of the most dramatic photos in freshwater fishkeeping.
Schooling fish. Wait for the turn. A school of tetras swimming in formation is a nice photo; the same school turning in unison is a great photo. The turn happens when something — a hand wave, a tapping on the glass, a feeding — spooks the school and they pivot. Pre-focus on the spot where the school is circling, watch the leading fish, and fire the burst the moment you see the turn start. The leading fish will be sharp; the trailing fish will be in motion blur, which is the point — the photo shows the energy of the school. Single tetras and rasboras are best photographed when they break from the school to inspect a piece of food or a plant, which they do every 30–60 seconds.
Post-Processing — Crop, Slight Contrast, Don’t Overdo It
Post-processing is where a sharp photo becomes a publishable photo, but the line between "polished" and "overcooked" is thin. The default phone edit — bump exposure, boost saturation, push clarity — makes fish look like plastic. Resist it. The edits that improve a nano fish photo without ruining it are: crop (to tighten the composition and put the fish's eye on a rule-of-thirds intersection), slight contrast boost (+10 to +15 in Lightroom or Snapseed), and a small white balance tweak if the colour is off. That is it. Anything more and you are inventing a fish that does not exist.
Cropping is the most powerful tool and the most underused. A 12-megapixel phone photo can be cropped to 4 megapixels and still look sharp on web display, which means you can take a photo of a fish that fills a quarter of the frame and crop it to fill three-quarters. The rule: crop to put the fish's eye on a rule-of-thirds intersection, with the fish facing into the open part of the frame. If the fish is facing left, the eye goes on the right third of the frame. Crop tight enough that the fish dominates the frame, but leave enough negative space that the photo does not feel cramped.
The "don't overdo it" list: do not boost saturation past +20 (the fish's natural colour is the goal, not a fluorescent version of it), do not use clarity or structure tools above +15 (they create halos around the fish), do not use HDR (it flattens the depth of the photo), and do not use portrait-mode fake bokeh on fish (the algorithm gets confused by the fish's outline and produces a weird plastic cutout look). If the photo needs more than crop + contrast + white balance to look good, the photo is not good enough — delete it and shoot another session. The fix for a bad photo is a better photo, not more editing.
Frequently Asked Questions
Can I photograph my fish with a phone?
Yes — a modern phone (iPhone 12 or later, Samsung Galaxy S20 or later, any Pixel) is more than enough for nano fish photography. The combination of burst mode, tap-to-focus, and computational exposure handling means a phone outperforms a cheap point-and-shoot and most entry-level DSLRs in the hands of a non-photographer. The limiting factor is not the camera; it is the tank preparation, lighting, and patience. Spend 30 minutes on those three things and your phone photos will look professional.
Why are my fish photos blurry?
Three causes: motion blur from a slow shutter speed, focus blur from the camera focusing on the glass instead of the fish, and ISO noise from low light. Fix the motion blur by tapping to focus on the fish and using burst mode. Fix the focus blur by holding the phone parallel to the glass (not at an angle) and tapping on the fish's eye. Fix the ISO noise by adding light — a desk lamp at 45 degrees from the side of the tank. Clean the glass inside and out before shooting; a smudge on the inside glass will ruin focus.
Should I use the flash when photographing fish?
No. On-camera flash produces glare on the glass, washes out the fish's colour, and stresses the fish. Use a continuous light source instead — a desk lamp, a cheap LED video light, or a window (indirect sunlight, never direct). Position the light at a 45-degree angle from the side of the tank, never straight on. The goal is even side lighting that brings out the fish's colour without reflections on the glass.
How do I photograph shrimp in my aquarium?
Wait until they are grazing. Shrimp in motion are nearly impossible to photograph sharply — their legs move fast and the camera focuses on the wrong leg. A shrimp stopped on a piece of moss or wood, picking at biofilm, is stationary enough for a sharp photo with any camera. Get at eye level with the shrimp (usually the bottom third of the tank), tap to focus on the eye, and shoot a burst of 10–20 shots. Keep the sharpest one. A grazing shrimp will hold still for 5–15 seconds at a time, which is plenty.
What is the best lens for aquarium fish photography?
On a DSLR or mirrorless, a 100mm macro lens is the gold standard for nano fish — enough working distance that you do not stress the fish, enough magnification that a 2 cm chili rasbora fills a third of the frame. A 50mm macro is a cheaper alternative that works for slightly larger fish (bettas, guppies). On a phone, the default 1x lens is usually sharper than the 2x or 3x telephoto — crop in post-processing instead of zooming in the camera app, which degrades quality.