I was at my lfs picking up some cichlids when I noticed some big ol' senegals. Around 12-13 inches each. I've always thought about getting one of these guys. Is the size above full grown? They were around 7.99 I think. Reasonable? Tank size? I have a 40 gallon with a few cichlids, around 3 inches each. Would they get along easily? Foods? How bout market shrimp? Fish fillets? Floating pond pellets? Algae wafers? Sorry for all the Q's, but I want to make sure I don't go wrong if I do purchase one.