I wouldn't always put a full algae sheet in the tank for the fish to graze on. In my opinion, that is a bit excessive. You have 100 lbs. of live rock. If you feed a well-balanced meal full of vitamins, meat and veggies once per day, your tang will be very healthy. He has plenty to graze on with the 100 lbs. of rock. You could put a smaller sheet into the tank once per day, but if you are going to do full sheets/strips, I would only do that every other day.