Low phosphate

good evening santa monica I am reading a post where you commented on this situation.

(Green growth on the glass does mean low nutrients near
the glass. But brown sps means high nutrients near the corals. If you have a lot of rock, which does act like a phosphate sponge in and out, what could be happening is phosphate flowing into the rock during feeding, and then flowing out of the rock and hitting the corals. It's a stretch, but would explain your situation because the phosphate has no place left to go.)

I have exactly this problem my phosphates are undetectable with several tests hanna phosphorus and salifert phosphate, and my sps are a little brown with retracted polipo and crystals with green powder, how can you solve this problem that I mention? I am currently using a surf2x without algae growth, thanks

Attachment 7860

How much and how often are you feeding, and are you leaving the food particles in the water?

food 3 times a day food flake, food frozen rotifers and pellets, it is worth mentioning that I have a skimmer very left over

Attachment 7862

Skimmer is operating, or is not?

Yes, it is working very dry

Ok try turning of skimmer. This will give the coral the food they need.

Good night santamonica, how do you see this growth in 7 days? 18 hours a day, today remove the black cloth.
Attachment 7865

What side was black cloth on?... the dark growth side, or the green growth side?