Stag coral dying from bottom up

[LovesDogs_CatsRokay]

What could be causing this stag coral to die from the base up? It was doing great in my biocube since September but I moved it to my reefer 350 a few weeks ago. This has just happened within the last week. The new tank has been running for about 3 months with a combination of Marco rock, Carrib Sea life rock and TBS live rock. The lights are kessil 360s.

Params are as follows:

Nitrates 16
Phosphates 0.08
Alk 8.1
Mag 1200
Calcium 355

I know the calcium is pretty low. Could this be the cause or is it soemething else? I don’t really have any other SPS in the ank except for a monti cap that is doing okay. All LPS look great.

 

[jda]

Point-source light shading in the main reason.