KK,
I wish I could offer some advice, but I had the same thing wipe out my SPS over the course of about 8 months. I was down to one single monti digi and it is now succumbing to whatever it was that killed everything else; it looks a lot like a poodle after returning from the groomer. I've changed lighting, salts, RO/DI filters, removed mud bed from fuge, removed rock, added flow, fed more, fed less, large water changes, small water changes, change GFO brands, no GFO, less GFO, more GFO, you name it. One at a time, my corals RTN'd even thought they still had excellent color and polyp extenstion.
Just to make sure I didn't miss anything, I removed my topoff storage container and rinsed it out. Didn't seem to be anything growing inside as there was no foul odor or slime buildup.
I wish I could offer some advice, but I had the same thing wipe out my SPS over the course of about 8 months. I was down to one single monti digi and it is now succumbing to whatever it was that killed everything else; it looks a lot like a poodle after returning from the groomer. I've changed lighting, salts, RO/DI filters, removed mud bed from fuge, removed rock, added flow, fed more, fed less, large water changes, small water changes, change GFO brands, no GFO, less GFO, more GFO, you name it. One at a time, my corals RTN'd even thought they still had excellent color and polyp extenstion.
Just to make sure I didn't miss anything, I removed my topoff storage container and rinsed it out. Didn't seem to be anything growing inside as there was no foul odor or slime buildup.