Can anyone ID these...

[flchevygrl]

Found these after our lights had been off for a few hours...

 

[nhbsab]

Looks like nudibranches.

 

[flchevygrl]

are they good or bad nudibranchs?

 

[anbosu]

They don't look like berghia nudibranchs to me, so they probably aren't beneficial.

 

[nhbsab]

I have seen similar one eat zoas

 

[tony727]

They look like ZOA eating nudibranch to me as well, but yellow.

 

[CREATIVE AQ TMP]

I believe they are sea slugs. I don't see the "naked gills" on them. I have seen them in our aquaculture tanks with nothing but red montis. Nothing yellow. Except little bit of yellow sponge under the tiles. Hardly enough to sustain a sea slug or nudibranch polulation. As quickly as they appeared, they disappeared. But I have for sure seen the same ones and did not notice any adverse affect on any coral.

 

[TampaSnooker]

Slug/nudibranch. I've seen them under, but never on coral. Suggests they specialize on a sponge or Bryozoan. They definitely aren't zoa nudis. I have had the same experience as Tom. Find them occasionally but not for long.