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

[whatcaneyedo]

How do these look for some before and after pictures? I tried experimenting with biopellets on and off a little bit about a year ago. At first I used the minimum recommended amount which I ceased after a month. The second time I used 1/3 of the recommended minimum amount which I also removed soon after. In each case almost immediately my soft coral bleached and some of my LPS faded in colour. These montipora faded a little bit as well but while the other species slowly recovered once I ceased using the pellets these montipora have not. They're both sort of in stasis, they aren't recovering and they haven't yet died completely.

My system is 5 years old, 240gal, lit ~8hrs daily with 250w 14K Phoenix bulbs on HQI ballasts, I do 10% weekly water changes with IO, Seachem and some Mg salts. 1 cup of carbon changed monthly and 1 cup of GFO changed every two months. Supplementing is done by Kalk and Ca Reactors. Aside from a variety of fish food no additional products are used. Nuisance algae and slime consists of valonia and a little cyano in the sand. Water chemistry is this today and only fluctuates a little bit from month to month (I keep records):
Ca 430 ppm
KH 10 dkh
Mg 1300 ppm
Nitrate and Phosphate undetectable for years with hobby grade kits
Salinity 1.025
Temperature 78 F

I'm thinking there are three things that I can do. I could retrieve some frags of these from some friends tanks and try to start over with them. I could continue the waiting game to see if what I have left will eventually recover. Or I could try some kind of bottled miracle product if someone could recommend one to me.