so for the last couple days, my tang is not as active as he used to be, he seems to be hiding a lot, and he doesn't eat the seaweed, i've tried 2 kinds already, so far all he eats is the brine shrimp, and i even throw in some kind of algae frozen food mix that the LFS told me their tangs eat, and he doesn't eat that either, just my hermit crabs eat that. I'm really worried about him, i don't wanna go crazy and buy every single food that's out there and try it, but i also want to keep him healthy. The spots on his body don't seem to have gotten any worse. What can I do? I've tested the water and it seems good, my clowns are perfect.