Bleaching Coral

[Piranha76]

I have an acro sitting on top of a rock that has green zoas. They were happy and thriving. This morning the acro was bleaching and the zoas were white or closed. All the other corals within that side of the tank are happy and open. Tank parameters 33 ppt, Nitrites 5, nitrates 0 ammonia 0 alk 8 Po4 ranges from .9 to .2. Always has ranged and have done fine. Any suggestions why just this rock and acro are having a problem? I did accidentally use the wrong super glue and it leaked and wasn't gel might be that?

 

[MERKEY]

phos swinging like that long term will cause issue as you are describing. Lps like it kind of dirty around .1 or .2

Acros and most sps like phos in the .05 range but not much over .1 and you don't want 0

I wouldn't worry about the glue, that happens to everyone at one point hahah