superman lobophyllia in touble

[muelpaul]

Hello there, I have had this lobo in my tank for 7 days and 2 days ago it started exposing it's skeleton...

It is currently on the edge of light given off from a 250w 14k MH.

My tank Parameters are:
SG 1.023 (will be adding 2 gallons of 1.026 to sump)
PH 8.1-8.2
Ammonia 0
Nitrite 0
Nitate 0
Phosphate 0
Alk 3.0 MEQL
Calcium 420 PPM
Temp 78 - 79

All my other sps and lps corals are doing fine...can this Lobo
be saved?

Thanks
Paul

 

[MinibowMatt]

at first appearance that looks like it may have gotten stung by something else? is that possible?

 

[muelpaul]

I have a long spined urchin that might have got it but I am not sure. I also have a cuke that was wrapped around part of it for 24 hours but not on the side that it's skeleton is exposed.

 

[Scythanith]

My long spinned urchin began going after corals once it had cleaned up all the available algae. Does it make its way on or around your Lob? Also, if the flow is excessive it can cause tissue recession. Your parameters look decent as well.