Red Algae

[Diomedes]

I had 2 small blue tangs in a 180, and we noticed that only one of them recognized this as a food source. He cleared it out in a week - but he was sickly looking and seemed starve.

Also there must be some urchin out there that will consmue the stuff providing you don't have any more palatable food sources in the tank.

Good Luck
Stephen