Sure looks bad whatever it is. How long have you had this little Dori? Do you have anything else in the tank with it like a green serpant or other fish that can get aggressive?
I would recommened that if you have a QT set up to put him/her in there soon. Without know what the problem is, like maybe a parasite or what not it will or may not have yet infected the other critters.
On another note, like stated above, get the hippo on a better diet with mysis and Selcon. Selcon is some good stuff. A little goes a long way. If not Selcon, cut a clove of Garlic in half and let the new food soak in it and then feed the mysis, or other meaty seafood.
I am sorry if this has been mentioned already, but what are your water parameters?
i have a tank with a small blue tang, ocellaris clownfish, polys, snails, blue linka star fish, and 2 hermit crabs. My blue tang has a large tear near its anal area. The tear is white and it appears that the fish is missing some of its meat. The fish also has bumby skin around its stomach area. What is wrong with my fish? Is it getting picked on? Or does it have a disease?
