What is this?

Yes, the phosphate uptake of bacteria can cause such precipitates.
Update: I did a blackout due to dino but this ended up disappearing to, but right when the lights came back on they are returning gradually.
What could this be???
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

    Votes: 32 45.7%
  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%
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