They can get to be 12 inches or more,the width of a standard 55. You could do it,but I don't think it would be an ideal tank for that fish. Make sure you overfilter the tank if you do. A nice size canister and a HOB would be my choice.
Id think so.I always hear that they can reach a foot but never seen one that big.Most max out at 8-10"If yours really gets that big the tank upgrade is worth it.