How many fish can I keep in a nano tank?

Fewer than a bigger tank per litre, because small volumes are less stable. As a rough guide a well-planted, well-filtered 30-litre nano might hold a single small shoal of 8-10 tiny fish plus a few shrimp. Understock rather than overstock — it keeps water parameters steady and the fish healthier.

How much do nano fish cost in the UK?

Most nano species start at about £2-£5 each, with rarer micro-fish and higher-grade shrimp a little more. As they're bought in small shoals, budget for the group rather than a single fish. Prices on this page are live: what you see is what's in stock today.

Do nano tanks still need a heater and filter?

Yes — tropical nano fish still need stable warmth and filtration. Small heaters (25-50 W) and gentle nano filters or sponge filters are made for exactly these tanks. If anything, filtration matters more in a nano because the small water volume gives less margin for error.

Can I keep shrimp in a nano tank?

Absolutely — nano tanks are ideal for dwarf shrimp like cherry and Neocaridina, either alone or with tiny peaceful fish. In a shrimp-only nano a colony breeds readily. If you add micro-fish, choose the smallest, most peaceful species so baby shrimp have a chance to survive among the plants.

Is it safe to buy nano fish online?

Yes. Small nano species ship comfortably in oxygen-charged, insulated packaging with a winter heat pack, carried midweek by a licensed live-animal courier. Dispatch is Tuesday or Wednesday for a short transit window, and every order carries our photo-proof live arrival guarantee.

Nano Tank Fish for Sale UK

Best nano tank fish for UK aquariums — species that thrive in tanks under 40 litres. Micro schoolers, dwarf species, shrimps.

247 products available

This page collects the small, peaceful species that suit nano aquariums — tanks roughly 10 to 40 litres. Everything listed is live stock held in our own system, dispatched with a licensed live-animal courier under our live arrival guarantee.

Nano fish stay small their whole lives and are calm enough for a compact, planted tank: chili and mosquito rasboras, celestial pearl danios, Endlers, ember tetras, sparkling gouramis, pygmy corydoras and dwarf shrimp all thrive at this scale.

The key with nano tanks is restraint — a small volume swings in temperature and chemistry faster than a big one, so stock lightly and keep on top of water changes. Read the nano notes linked below before ordering to plan a group that won't outgrow or overload the tank.

Current delivery and offer information

Follow each link for the latest terms before ordering.

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Frequently asked questions

Genuinely small species that stay under a few centimetres: chili and mosquito rasboras (Boraras), celestial pearl danios, ember tetras, Endlers, sparkling and honey gouramis, pygmy corydoras and dwarf shrimp. These stay small for life — never a juvenile of a fish that grows large. Match the shoal size to the tank's litres.

Nano Tank Fish for Sale UK