ID plz. Are they harmful?

[Leo73173]

Are these harmful found three in my tank so far.

 

[lhoy]

Do you have zoanthids? If so, definitely remove and probably should remove to be safe anyway. What they eat is probably something you want to keep.

Lee

 

[kizkiz]

They're nudibranches of some sort.
Most are bad news for somethign or other as they have very selective diets (just zoos, or acros etc)

Get an id and i would remove i expect

 

[davocean]

Those are nudis, and pretty much all nudy's are not good.
Ditch it.

 

[Leo73173]

That is what I figured. I do have zoos and that is where I have found 2 of them.

 

[LeslieH]

Yeah, it's an aeolid nudibranch, part of a group then tends to specialize in corals & other cnidarians. Not a good one to have if you like your zoos.

 

[Tang Salad]

Consider dipping the zoo colonies and keep a close watch on them in the coming months. The nudis you removed may have already laid eggs.

 

[Leo73173]

Well I think I will have to keep an eye on them because they are attached to a main rock that I am not willing to remove right now. If they seem to get out of control then I might.