Before and after biopellet photos. How do I bring my montipora back to life?

[whatcaneyedo]

My carbon and GFO come from BRS. Both were purchases a year ago, the GFO is the regular granular and the carbon is fine lignite.

I believe that over depletion of nitrate and phosphate was the case too. However I do feed my tank heavily. 1/6 nori sheet daily, Formula one pellets 3 times a day (amounting to 1/2 tsp I think), a cube of PE Mysis 3 times a day and a 1"x2" slab of silversides or krill every second day.