Welcome to the Board
Feeding 3 times a day...
I also have a 125 with a hipo in it. I only feed my fish once every 2 days and have no problem. This allows my tangs to be tangs and actualy be forced to eat any algea in the tank. All my fish are very healthy and are nice and fat. I would cut right back on feeding.I think that may be the largest problem you have in my opinion. What are your levels at?
Thanks
Rob