CK's can get that big. It would take a loooong time but its possible. And they would need ALOT more than 110 gal. He was probably lying about their size. ..unless he was pretty much torturing those poor fishies =(
it makes since. 48" long(left to right) 18"wide(front to back) and 30" deep
(top to bottom, deep like how deep is the hole, or deep as in how far down is it)