Has anyone ever seen this before?

[magikfly]

A few weeks ago I noticed my corals (all SPS) lose all PE and color. I initially thought it was something to do with the waterquality so I sent out an ICP. It came back fine.
I took another look and saw a bunch of small vermetid snails which led me to believe the mucus nets are irritating the corals to the point of death. Take a look at the pic, you can see the strings clinging to the tissue. These strings are all over the tank. Another thing I was thinking about is calcium precipitation from a somewhat high pH that ends up forming these strings.
Params:
NO3: 10, PO4: 0.8, Ca:420, pH: 8.3 - 8.5, kH: 8.3 all stable for months.

 

[p1u5h13r4m24]

That net doesn’t look like vermetid, but your phos is super high. Slowly and I mean slowwwwllly drop it down to at the very least .2

 

[Clarkjw2002]

I see the vermetid tubes (possibly) on the rock there but, generally, repeated slime irritation only causes lack of polyp extension/tissue recession in the area where the slime repeatedly contacts, if at all. Just my experience, other experiences may differ.

 

[get-salty]

Only thing i can think of is - Flow.

I'd increase the flow, at least to blow away the webbing.

 

[magikfly]

That net doesn’t look like vermetid, but your phos is super high. Slowly and I mean slowwwwllly drop it down to at the very least

The 0.8 PO4 is a typo, it should be 0.08

 

[p1u5h13r4m24]

My next guess. Assuming all your levels are good and stable. Check for tiny tiny bugs a little smaller than the polyps. It almost looks like some white acro bugs on there