i hope you had better luck than me....i put a 6 inch rtc x tsn in my 240g cichlid tank and all my cichlids are 5-6 inches except a few which are 4-5 inches...i only put him in there until my water temp in my temp indoor trough pond came up enough to put it in there...weeellll it was 1 night to many...he had a big fat belly this morning and 1 of my 4.5" blue ahlis is missing....tha cat is going in the trough pond as soon as i get home today.