Well, thing is, they can grow pretty amazingly fast. So I am always hesistant with uncertain plans. I've seen them grow, IMO, too large for a 75g tank within a year. If it was "oh I have a 180 in the other room"....but realistically most people PLAN for a larger tank and then don't get it. Then you've got an issue. Because the larger these sharks get, the more trouble you can sometimes have getting the right home for it. You are attached to it, and inclined to keep it even in substandard situations. At the immediate moment, no, I don't see a problem. But I see a problem with not having the firm plans...and maybe not the firm several thousand dollar budget for the next appropriately sized tank.