so what size tank are we talking here? I mean it seems to me like he's very happy and i dont see why he would be "stunted" i could probably set him up with a bigger tank, but not like a 200 gallon like previously mentioned. The biggest i could go is probably the 104.5 gallon tank that i own (dont ask weird ammount of gallonage i know lol) would that be suitable? but there are complications with that as well because that is currently hosting some rather large SW fish
a bkg would need a tank of at least 6' long and 24" wide height wouldnt matter as long as you kept it covered well . But you would also be able to stock with more fish, so theres an upside lol
from a person who's had several Ghost knives live their full lives...they NEED 200G 24" wide is not enough for a fish that will get over 3' long. it's simply assinine to think that you can force a fish to live in that kind of condition! Take it back if you dont listen to advice. there's no buisness keeping a fish you will kill.