My only problem is with it's tail. It doesn't look healthy and I cannot figure out why.
Mrdc:
When you say it doesn't look healthy are you referring to the tail or the whole fish? I assumed you meant the tail? I have a healthy hippo about 4 inches, and like yours its a pig and eats everything...I noticed a similar problem with the tail and then discovered one day that my blue face angel was tail nipping during feeding to (of course) prevent the hippo from getting the lion's share....do you have any angels or any thing which might be a tail nipper? If you are referring to the fish itself as unhealthy I did read somewhere
that larger hippos tend not to be as bright blue, even though they may be perfectly healthy
I have no idea if this is true...mine is not so big but does always seem to be faded in the ventral area (stomach?)
And also I have noticed that of all my tangs, naso, yellows, and hippo, the hippo is the most sensitive to nitrates and water quality issues.