Damage to SPS on underside of branches

Semillon

New member
I noticed recently that on the underside of some branches of two of our SPS colonies the flesh is gone and strands of slime remain behind. Other colonies remain unaffected, growth is decent and colour is great on some colonies and decent on others.

Water parameters:
PO4: 0.00 (Hanna checker)
Alk: 7.7
Ca: 400
Mg: 1350
N03: 0
Sg: 1.025

The tank is a Red Sea Max 250 (75 gallons), flow comes from two Vortech MP40s.

Has anyone seen similar symptoms to this before? We do not have any coral gobies.
 
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