tank crash?

[MitchM]

I would work on getting your SPS healthy again, after that problem a month ago. Work on tweaking the colors with Zeo or Probido after things have settled down.
If you're having PO4 issues, it could be from your sandbed. You might want to think about thinning it down to a half inch or so.
Sandbeds will work for a while while they're new and depending on your cleanliness routine can be left alone for up to a few years. After that PO4 will continually leach out.
IO is a basic salt, so you will need to add some things - Mg, Ca, Alk.
There's no guarantee that the SPS will come back.
Good luck!