Over the last 6 months my tank has been crashing. I had issues with a few of my Red Sea lights not coming on because of bad power supplies (I also have T5 lights also though). During that time a massive die off of SPS started happening. I assumed it started because of the lights and then created a domino affect. ALK stopped being consumed causing a spike there which then caused more die off, higher nutrients, higher ALK again, and so on. Most all of my SPS and a lot of LPS is now gone except for a very large Monti and a birds nest. I used to have thick coralline covering my rocks, glass, and powerhead. Every single inch of it is now gone. Anemones and remaining LPS/softies seem to be doing okay for now. But now my Monti has started to die now too. My Triton ICP test came back completely clean except for phosphate at 3.0mg/l. Is that phosphate level enough to keep the death fall going? Is there something else that may be happening that wouldn't show up on an ICP? Fish are doing amazing. 310G with 75G sump, 6 tangs, 1 queen angel, 1 mag fox face, 6 anthias, 10 chromis, 2 wrasse, and 1 blenny.
