I currently have 4 bronze corydoras, 1 albino corydoras, 5 zebra danios, 4 ghost shrimp, 1 mystery snail, 1 netrite snail, and the dwarf gourami. They live in a 20 gallon high, I moved the albino and one of the bronze cories from an established 10 gallon to here. I used old filter media, old decorations and added tetra safestart just in case .