I have a small hippo tang that I introduced into my dt from my quarantine tank yesterday. I know they need vegetation in their diet so I got sheets of algae in a pack at the lfs. I put some in my tank but none of my fish eat it. I have 2 clowns 3 bengai cardinals and the tang and they all just ignore it like they don't know its food. Is there some way I can get them to realize that it is food and eat it? I've used it in tanks before and my tangs always took right to it so I don't know what to do.