I also have a fish tank at home. It only have one fish in it and I don't really look at the tank or even feed the fish. Last nite I took a look at it and saw this in it! Its a pleco, one of the sucker fish like like to eat the algae in the tank. He is HUGH now!!! I don't realize it had grow to this big! I got him couple year ago and he just keep growing. Its amazing how big he can get with so little food he got and given the bad water condition... I got to look closer into the tank, maybe there will be some other monster in there!