Is it fin rot from a bacteria or just from fighting?
I'm doing something similar by running mostly whites on my tank.....I've browned out a bunch of my corals but I still get polyp extension and growth...
I wouldn't go crazy over it
Where did you get this food from? I've never heard of itok, another tank update. So far so good. I've been feeding the fish medicated food for the past month. Twice a day with Gram positive food, and twice with gram negative food and the Tang fin recession is recovering very nicely. All that needs to finish growing back is the Yellow top rear dorsal fin. Now that I see how much of the fins have grown back, the yellow tang had a lot of fin rot before I received it. The fish food really seemed to do the trick and was inexpensive, $8 per 8 oz bag and all the fish really like it. It's from Angelsplus.com if you are interested..
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Where did you get this food from? I've never heard of it
Looks like some nice growth on the sps. You can bump the nitrate up a bit. Always make me nervous when it’s zero.