Unlike other tangs which eat algae in the wild, the Hippo or Pacific Blue Tang is omnivorous. It eats primarily meaty food.
Accordingly, I feed it pieces of shrimp and it gets its algae from the pieces of nori which I feed the other tangs.
I soak the food in garlic extreme and add selcon from time to time.
These fish are ich magnets so the garlic is a good preventative.
Thanks

Mine just eats algae from rocks and glass.
This fish is so fat it's belly is like a drum.
Will have to sale her soon and get a smaller one for my 60Gal tank