Carbon

I'm starting to think it was the fast addition of carbon that caused the decline of my SPS. I was so afraid of the Metro medication affecting my inverts that I used about 3/4 of a cup in my bulk reef supply reactor. I thought this was taking it easy but I may have stripped out too many nutrients too quickly. This would explain why I've seen carbon negatively impact some of my corals before.

I'm not totally sure what caused the crash but here are some other possibilities:
1. The metro medication itself.
2. My home made food. Unlikely but it is something that changed.
3. All the extra feedings. Trying to get the trigger to eat as well as my copper banded butterfly.
4. Change in lighting. I changed my bulbs in February. One of my corals started declining immediately. Maybe the others took time to catch up.
5. When I moved my trigger to a hospital tank I started mixing salt in a new Rubbermaid roughneck storage box. Unlikely to cause issues. Salt was never stored long and my purple digitata started declining before I pulled the trigger out.
6. I recently changed the restrictor on my RO unit to have less waste water and to produce water more quickly. TDS was still 0 out of the RO/DI so it is unlikely.
7. Too much carbon too fast.

In my opinion the most likely causes were the Metro and/or carbon. I doubt the extra food caused issues since some of my corals were coloring up nicely before disaster struck.