Bleaching Out

Waffen06 · Jun 16, 2020

I dont normally keep sps but saw one cheap a month ago. Been doing fine till I noticed it looking like this yesterday. Any ideas?
Phos .03
Alk 7.3
Calc 400
Temp 79
Salinity 1.024
PH 7.8
Ammonia 0
Nitrites 0
Nitrates maybe 5.0
Had it about halfway up my 60 gallon cube under a Kessil 360. Nothing added in weeks, everything else looks great.

tsouth · Jun 16, 2020

This looks more like the culprit of RTN. I do not know much about this aside from that it is possibly triggered by a sudden swing in Alk.

Perhaps this is a resource that could help you distinguish the issue at hand, and guide you towards saving the coral if you wanted to. All my best to you!!
https://9reef.com/blog/understanding-and-resolving-stn-and-rtn-on-sps-coral/

Charlie’s Frags · Jun 16, 2020

Tissue necrosis from starvation (not enough light). Kessil 360 on a 60 gallon cube will not provide enough light for sps that far down. Cut it above the recessed tissue, remount and move it up to the top.