let me guess youve been watching a movie with your kid right.
there is a post on the fish discussion fprum about this now.
first are you experienced with saltwater aquariums?
if not ,dont even attempt these fish.
the hippo needs a 6 foot long tank and is very disease prone.
they need excellent water quality form an established tank with alot of live rock.
sorry to be so blunt but these fish are very fragile and need alot of attention to filter set up .