Mysterious creature

[shores94]

I just recently had an SPS frag completely die off and peel within 36 hours. All my other corals are doing ok so it was very surprising. When I was looking in the tank after dark last night I saw something on the sps I thought was either debris or maybe algae. How ever coming home from work today I saw the same thing on one of my chalices corals. I’m wondering if anyone knows what this could be. If you also look at the chalice on the left it also had some bleaching a few weeks ago. I’m wondering if that’s related
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[KrisReef]

Appears to be a nudibranch of some kind. They have been known to be predatory on some corals, but there are many varieties. Based upon your post I would try and remove this from your tank and hope that they are not breeding in your tank.

 

[shores94]

Appears to be a nudibranch of some kind. They have been known to be predatory on some corals, but there are many varieties. Based upon your post I would try and remove this from your tank and hope that they are not breeding in your tank.

Just recently got a new mushroom so probably came in on that. I was able to get it out