Need help - what the heck is going on here?

[SPS2020]

This does not seem to move at all. I was wondering if its some sort of Ca/Alk precipitate but why would that be purple or pink and not white?

Oh...I was just looking at the glass.

A few bullet points that may help:

Manually remove as much of the GHA as possible, daily. That back wall is a good starting place! You have to keep on top of the GHA or it will come back.​

Do water changes and try to syphon out the purple stuff along with the cyano. Vacuum the substrate.​

Peroxide can help with GHA, but do some reading on that prior to use!​

Do research on ReefFlux and how it will affect your corals. I'd try other methods before chemicals.​

Others have given some good advice above as well (i.e. flow). Try lowering the powerheads and get water moving down low.​

 

[ISpeakForTheSeas]

I’m curious if you have any updates on this OP - are you still having this issue/did you ever confirm what it was?