Monti stripping

[Haus]

I have a monti digi that has been doing great-good growth and color, polyps always extended, etc.

But over the past week or so I’ve noticed the polyps are stripped clean in part exposing bare white skeleton underneath. Parameters are good, all other Corals are healthy. I look at night and don’t see nudis or bugs, I’m leaning toward blaming the emerald crab. I had used hydrogen peroxide in small amounts to blast some algae before this happened, could that cause this?

Third picture here is a stalk that I broke off the main colony (also visible in first pic)-that was halfway stripped, now I can see polyps on the white side where I saw none before.

Thoughts?

 

[Trio91]

The emerald crab shouldn’t bother corals, they’ll pic algae and scavenge but that’s about it. I have one in my tank for the longest without issues.

The 1st n 3rd pic, the corals are definitely bleached by something. Maybe the peroxide made direct contact with the corals??? The 2nd pic looks like a bite mark but could the start of bleaching as well

 

[Haus]

Is that bleaching? Strange pattern and I find it strange that the polyps are wipes clean in those white areas. It looks smooth as bone. The stalk in the third pic was that smooth as well until the polyps started appearing again a couple of days ago, and some color is coming back too.

 

[diana a]

are there any corals that could be stinging it?

 

[Haus]

I had fragged the playing monti next to it a day or two earlier, so maybe that caused a response that affected the digi. There was visible stringy trailers of sort coming off the playing monti in the direction of the digi.