...But I cant find a simple answer anywhere , recently perchased my first small(ish) aquarium, its a 80L and is currently cycling before I add any fish . Once I have succesfully introduced my first few fish (yes over a period of weeks) I would much like to have a small cat in there (fish of course )...Which could you recommend that 1)Wont out grow my tank 2)Cause problems in a community set up...Any help much appreciated!