Zoas melting

[KelpMeOut]

Hey there my zoas seem to be melting. Wondering if anyone has a clue. My parameters measured on Saturday ph 8.1 dkh 9.1 mg 1260 nitrate 20 ammonia 0.25 Ca 260 (dosed about 100) PO 0. I was thinking us was just sand or because the mg was spiking which is why I started dosing.

 

[blaxsun]

They just look temporarily closed up (they'll do that sometimes after feeding, something disturbs them or they're trying to promote cleaning from the cleanup crew).