Another critter ID please

[MrsDragon]

Found this one floating around the tank and it finally settled on the rock so I could get some pics. Can anyone tell me what it is? It's barely 10 mm, under 1/2 inch long

 

[jayhawk]

Nudibranch

 

[MrsDragon]

Is it a good one or a bad one? I'm trying to get rid of Aiptasia

 

[Kano]

Sap-sucking Slug F It's about half way down the page. Looks exactly like your picture.

 

[MrsDragon]

Thanks Kano. Definitely looks like that. On further Googling of the name, I came across this info -
Opisthobranch of the Week is Oxynoe antillarum

This one was great -
Powered by APG vNext Trial - Oxynoe Antillarum | MASM Forums

Not much other information anywhere though. A paragraph on most of the sites I looked at.

 

[gpdno]

Looks like a Sap Sucking Sea Slug to me. I have a few in my refugium. Pretty cool, they change color depending on the algae they eat.

 

[MrsDragon]

Yep. That's the verdict.

I had just chucked some food in because I was worried about a fish that's in there. Was watching the fish and saw these weird things coming out of the rock. They look like tentacles
.

 

[Tahoe61]

The arms of mini brittle stars, harmless.