Need an ID on this (and if it's bad)

[Biff0rz]

When I turn my return off and then on again, these get spit out of the return pipes, but I also don't see anything coming from the sump. They range in size from the size of mysis to a large clump of mysis. Started 2 days ago. Ideas?

 

[DanyL]

That's a Nudibranch - 99.99% a bad one.
It could be Montipora Eating Nudibranch, Zoa Eating Nudibranch or an Euphylia Eating Nudibranch.
There is also a 0.01% chance it's a Berghia, a desired Aiptesia Eating Nudibranch, but I wouldn't count on it.

I advise you to look closely on your Montis, Zoas and Euphylias, you'll most likely find more and be able to identify what kind of Nudibranch you're dealing with.

 

[Biff0rz]

That's a Nudibranch - 99.99% a bad one.
It could be Montipora Eating Nudibranch, Zoa Eating Nudibranch or an Euphylia Eating Nudibranch.
There is also a 0.01% chance it's a Berghia, a desired Aiptesia Eating Nudibranch, but I wouldn't count on it.

I advise you to look closely on your Montis, Zoas and Euphylias, you'll most likely find more and be able to identify what kind of Nudibranch you're dealing with.

Looking at all 3, I see none. My Monti, zoas, and torches all look fine. These only come out of the sump return pump and there are many of them at a time. How can I positively ID this as a nudibranch? Microscope?

 

[DanyL]

Looking at all 3, I see none. My Monti, zoas, and torches all look fine. These only come out of the sump return pump and there are many of them at a time. How can I positively ID this as a nudibranch? Microscope?

They are sometimes hard to spot on the coral itself, try looking at the base and underneath the coral too.

I also advice you to look for better pictures online and compare, while I'm quite positive it is what I think it is your images aren't clear enough to guarantee 100% correct identification.

 

[Biff0rz]

They are sometimes hard to spot on the coral itself, try looking at the base and underneath the coral too.

I also advice you to look for better pictures online and compare, while I'm quite positive it is what I think it is your images aren't clear enough to guarantee 100% correct identification.

Most of my corals are glued to the rock, I'll try looking a lot closer.

I looked at some pictures and I cannot see the similarities so I'll collect some and get some better pics.