My favoirtes are the craigslist ads that say "Large fish tank for sale" and you open it up and it's a 20 gallon. I've seen 3 different ones in the past month or two.FSM;2497329; said:I think 55s are terrible tanks for big cichlids. People see them as a large tank, but really I don't think a 12+ inch fish should be in a tank where it has no room to swim front to back, only side to side. A 75 gallon is an excellent size, though. Look on craigslist for a cheap used one, just make sure it doesn't leak lol.