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Our Aquarium Stocking Calculator can be used as a guide to help you work out how many fish you can keep in a tropical freshwater, tropical marine, or coldwater aquarium.
Due to advances in the marine hobby, it is now possible to keep fish and even corals in small tanks like the Fluval Sea Evo and other tanks of similar volume.
This is one of the most frequently asked questions, and one that we’ll attempt to answer here. But it is subject to many variables which need to be addressed first.
BiOrbs are very popular aquariums and come in a number of sizes including 15, 30, 60 and even 105 litre volumes, but how many fish can you keep in each one?