kien's 150g Room Divider Mixed Reef & Stuff

[kien]

Oh how I love this hobby! So 6 plus months of great growth and general SPS coral vitality and now a couple of them have decided to start STN'ing on me... So far they aren't beyond saving but I can clearly see blotches developing at the base where they are losing cells.

If I had to guess, and I suppose that's what I'm doing at this point, I would blame it on the bio pellets. I've been using them for about two months now and they have pulled my nitrates down to zero after 4 weeks. I assumed that my fish load would be enough to sustain my SPS but maybe not. Maybe the corals are starving? Looks like I need to look into supplemental feeding.

Nothing else has changed in the tank. All params are in check.