cats and fish tanks do not mix well if you have any wires or hoses hanging from them. This happened 3 or 4 years ago now, but the cats decided to chase each other behind the tank when in the middle of the night, and lets just say I woke up to an empty 77 gallon tank and a carpet with 77 gallons of water in it and a pump running dry.
The only good thing about that incident is I decided I hated cichlids and turned it into a reef
