Best Fish for a 5ft / 150cm (≈300 Litre) Aquarium

A 5ft tank suits bigger and messier fish, large schools, and impressive community or cichlid displays. Strong filtration is a must.

Approx. volume300 litres
Typical dimensions150 × 45 × 50 cm
Weight when full~370 kg full
Rough stocking~50 small community fish + clean-up crew

Plan exact stocking →

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How many fish fit in a 5ft / 150cm (≈300 Litre)?

As a safe guide, a 300-litre tank holds around 50 small community fish plus a few bottom-dwellers or shrimp, kept understocked with good filtration. Add fish slowly over several weeks and keep schooling species in groups of six or more. Our stocking calculator works out the exact numbers for your chosen fish.

Best community & schooling fish

Centrepiece & feature fish

Bottom-dwellers & clean-up crew

Frequently Asked Questions

How many litres is a 5ft / 150cm (≈300 Litre)?
A 5ft / 150cm (≈300 Litre) holds roughly 300 litres of water once you allow for substrate and the gap below the rim. Typical dimensions are about 150 × 45 × 50 cm.
How many fish can a 5ft / 150cm (≈300 Litre) hold?
As a rough guide, around 50 small community fish plus a clean-up crew, kept understocked with good filtration. Use our stocking calculator for your exact fish.
How much does a 5ft / 150cm (≈300 Litre) weigh when full?
About ~370 kg full including water, substrate and rocks, so always use a stand rated for the weight on a solid, level floor.
What is the best fish for a 5ft / 150cm (≈300 Litre)?
It depends on the look you want, but the species listed on this page all suit a 300-litre tank. Pick fish with matching water needs and add them slowly.

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