Doing another water change today. Randomly lost an sps frag that was doing great for months. My skittles cyphastrea which I've had for years, slowly died. War an peace favia is starting to recede. Mini scoly is receding. I found an anthias dead in my mp10 this afternoon. First fish I've lost in this setup.
I bought a tux urchin to start eating some turf algae. He's doing a great job at it so far.
I was thinking a possibility being copper from somewhere but all invertebrates are doing great (serpent star, urchin, snails).
Any other thoughts of what could be wrong?