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I have a 20 gallon aquarium. It is currently stocked with: 1 male betta, 2 dojo loaches, 1 male guppy, 2 otos, and 1 black mystery snail. (plus three swordtail fry in a net-box who will be going to my LFS) How many cory cats would I be able to add to my tank safely? I saw some lovely chocolate-brown ones at my LFS, and although I haven't been able to identify them yet, I'd like to get 3 or 4 of them to add to my tank. Would that be too many, or would it be ok? Could I even get more, if i chose to?