mfinn
Surgeonfish
The precipitation is possible as I've also got bad clumping of my SB. (Freaking sand bed) But I don't know how to fix that issue. What causes it? I dose BRS 2 part via a doser, hours apart 3x a day. My Mag is at 1400, ALK 9, Calc 420 and PH 8.2 all per RedSea, tested 2 days ago.
Cut back on the dosing.
I know this sounds un reef like, but forget the test numbers for now.
Keep doing small water changes, remove sand with each water change.