Troubles with Favia/Favites

alten78

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Hello all, as the title says I am having trouble keeping favia/favites and recently a Hollywood Stunner chalice. It appears that the tissue is receding at a very slow rate but so far nothing has perished. What is puzzling is that I've had a Hollywood Stunner in my tank for a year, grew and colored like crazy, sold off several frags and eventually the whole colony but kept one small frag, it too is looking terrible but alive...I think.

Tank specs, 75g 6x54 T5's alk 7.5-8(hanna), CA 420 (salifert) no3 10-20ppm(salifert) po4 .03 (hanna). Haven't seen any fish touch them - Orchid Dottyback, false perc clowns, bangaii cardinals, foxface rabbitfish, tomini tang, and CBB. Nothing has changed that I know of, SPS are good and growing, the only other LPS in the tank is a Frogspawn and its growing crazy.

I keep everything on the bottom of the tank (bare bottom), flow isn't super heavy but its up there? I don't have a par meter so im not sure what my readings would be. Pics to follow!
 
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