i bought one from aquarium paradise a while back when it was about 4 or 5". had it for like a year or so till recently about 8-10". pretty easy to take care of. i had it in my 55 with a oscar and angelfish. he only came out at night but still seemed to make my fish nervous almost 24/7. packs quite a punch. if your hand is in the water near him and he gets startled you can get shocked. didn't expect this at all!! lol. i fed him massivore pellets and feeders at night. i think he is the culprit to the death of my 8" pleco so no other bottom dwellers!!! good luck