Hippo Tangs have almost no defense against ich in captivity. They often rely on other organisms to clean it off for them, but you will still see it on them from time to time.
My Hippo came home from the store with ich. You have to understand that ich is almost everywhere in small amounts and that most fish fight it off regularly using their mucosal secretions as defense. Hippos simply don't do it as well.
I noticed that mine "hovered" near my coral banded shrimp quite often. The CBS wasn't smart enough to pick up on the clue, but I was. I bought two cleaner shrimp the next night and it took about three days for the hippo to train them how to clean ich.
He still gets flakes on them from time to time, but it's the sort of thing where he gets them in the morning for a few hours and they are gone by the afternoon.
If cleaner shrimp aren't to your liking, you can also try neon gobies. They are long and black with a blue streak (opposite coloration to hippos) and are a more aesthetic choice than the shrimp. Cleaner wrasse are NOT the right thing to use as they tend to be more symbiotic with much larger species of fish.
Just bear in mind that you will find a few flakes on him from time to time unless you try other forms of filtration. It's completely natural and harmless if you provide him with an appropriate cleaner and shouldn't endanger other healthy animals in your tank.
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