Which First Fish Should You Choose for a 60-Litre Aquarium?
A 60-litre aquarium is an excellent first tank, as long as you don't stock it too quickly or too densely. A study published in 2025 in Frontiers in Marine Science, looking at the combined effect of stocking density and ammonia, confirmed that overstocking directly harms fish growth, physiology, and welfare (study on Google Scholar). Choosing your first species is therefore as much about compatibility as about biological load. All our setup benchmarks are gathered in our aquarium habitat and setup section.
Wait for a cycled tank before any fish
No species, however "bulletproof" its reputation, thrives in an uncycled tank: the ammonia and nitrite produced by the first residents burn their gills. Wait until your tests read 0 mg/L ammonia and nitrite, as detailed in our guide to setting up a 60-litre aquarium step by step. This invisible but decisive stage is what separates a successful start from a wipe-out.
Hardy species suited to the volume
In 60 litres, favour small, shoaling, parameter-tolerant fish: a school of ten to twelve neon tetras or harlequin rasboras, a small group of corydoras for the bottom, or a few platies if your water is on the hard side. Avoid species that outgrow the tank (goldfish, giant gourami) or that need schools of twenty. One well-stocked school beats three stressed, solitary fish.
Introduce gradually, without overstocking
Add fish in small groups, one or two weeks apart, to let the filter absorb the new load. The stocking rule is explained in detail in our guide on how many fish fit in a 60-litre aquarium. When in doubt, stay under the theoretical limit: a slightly understocked tank is always more stable than a crowded one.
Frequently asked questions
Can you keep a goldfish in 60 litres?
No, a common goldfish reaches 20 to 30 cm and produces a huge amount of waste: it needs a much larger volume or a pond.
How many fish for the first addition?
Start with five or six individuals of a single hardy species, never the whole stock at once, so you don't overwhelm the filter.
Should you mix several species from the start?
It's better to add and stabilise one school before introducing a second. Find all our guides on the aquarium hub.
This guide is part of Planète Pets’s Fishkeeping universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.