Nudibranch ID

[CRABDADDY]

Just got this guy in on a frag and trying to decide whether to remove him or put him in the tank.

 

[WheatToast]

Looks like a harmless Elysia slug, which is not a nudibranch but still a type of sea slug. These will suck the “sap” out of some green algae and steal their chloroplasts to photosynthesize. I once had one that ate Codium, but ReefCleaners says they will also feed on Ulva, Penicillus, and hair algae. Be careful to make sure your pumps and inlets are protected to prevent the slug from being sucked up.

Elysia obtusa:

Elysia viridis:

 

[CRABDADDY]

@WheatToast Thanks for the ID on that guy. I put him into the tank. Once I dipped the rest of the frag I found this, which looks like a monti eating nudi. Does that seem right to you?

 

[monkeyCmonkeyDo]

Or zoa eater. Or aptasia. They look the same usually but take on the color or fluorescent colors of the thing they are eating.
I wouldn't have put that in my tank but that's me. I Play it as it's better safe than sorry.
If I can't ID it it goes.
D

 

[WheatToast]

@WheatToast Thanks for the ID on that guy. I put him into the tank. Once I dipped the rest of the frag I found this, which looks like a monti eating nudi. Does that seem right to you?

Looks like a type of aeolid nudibranch, though I don’t know too much about these coral pests.
@blaxsun
@vetteguy53081

 

[Katrina71]

I'm certainly no expert, but +1

 

[CRABDADDY]

Should I just toss the whole frag out? I got it for free, so I'm not too broken up about losing it.

 

[vetteguy53081]

Very hard to see on my phone but looks like yellow caulerpa slug or oxynoe nudibranch