Whats wrong with my efflo ??

[FWC]

Nitrates: 0
Nitrites: 0
Ammonia: 0
pH: I'll test for it tomorrow.

Salinity is at 2.025

Running dual T5's ,bulbs are hagen brand ,and about 8 months old (Ya ,its time for a change)

I've had the efflo for a good 5 months at least ,yes ,it has grown a bit since I got it ,had killer polyp extension up until a few weeks ago .I have a 425 gph powerhead near it.

The sps around it is all doing fine ,its just the efflo and a peice of acro growing on the other side of the tank. It looks similar ,however it is smaller on the acro.

The spots look like the tissue is damaged/ripping off. Also their pretty small :P

Could it perhaps be emerald crabs ?? I only put them in a few weeks ago (the tissue damage started to show around that time) I dunno. I just really want this efflo to live.