I've posted a few of these looking for ideas. I know people will say ur tank is full and all that but I don't think so and other professionsals have said it isnt. Now my arowana is being traded in this saturday along with my firemouth but I'm still unsure if i wanna get rid of the FM. the tank is 75 gallons with 1 severum, 1 sun cat, 1 angel fish, 3 bichirs(2 senegals and 1 palmas) and a small growing pleco dont know the name. these are the fish left over after the trade in. My tank has mostly bottom dwelling fish. I wanted to another middle swimming fish and a top swimming fish. Any ideas?