these fish grow to 10 inches in the wild, my co worker keeps 3 of these guys in a 55 gallon, he's probaly had them for close to 4 years and they all seem to have maxed out around the 8 inch mark, they seem to really thrive on current, he keeps an aquaclear 50 running at all times with the air attachment, they are voracious, the fish were purchased at 3 inches and where kept with a few different types of south american cichlids, around 5 inches the fish seemed to grow into there reputation and managed to kill a basketmouth cichlid and an orange pike cichlid in a matter of a few days, and the few other fish were then removed before meeting there fate, unfortuneatly, my friend will not sell me these fish and the lfs that stocked went out of business a few years ago, any recommendations on where I may be able to find a few of these guys would definatly be appreciated, as I have not seen them online or in any lfs in my area