If you don't have a cleaner wrasse, I would get one. I know some people don't like that, but my Naso and Wrasse are best friends and he's ALWAYS clean since I added the wrasse. I'm lucky because my tang eats everything I put in the tank, but he really goes after Formula One VHP. It's has a gel base so it stays together. I cut it into small chunks and add it in with the brine & mysis. The tang and lawnmower blenny tear it up. Be careful not to use too much because bristleworms love it too. Do you add garlic guard to the food?