hey pisces01 , i have a large hermit crab and my icky hippo follows him around everywhere. is your tang nudging at inverts? if it is theres a good reason, cleaner shrimp will eat the ick off of some tangs and the fish allow it.my hippo and i belive your kole was on the list.I dont have a cleaner shrimp so i guess he's trying any invert he can find.also soak his food in a good vitamin suppliment such as (KENT)ZOE,this will provide essintial vitamins-&-nutrients,that will build his ammune system and help to battle the ick and help keep it from coming back.i found all this info from doing a search on this site, which i suggest you do because you,ll find alot more info. good luck