Need another ID please.

exnisstech · 2026-10-24T11:46:24-0400

Saw this critter in the tank the other day. It was approximately 3/8" long. I didn't touch it so I don't know if it has a shell or not. The tank is a recent move (3 months) and I cycled it with 35lbs of gulf live rock. @ISpeakForTheSeas any idea?

Saltyreef · 2026-10-24T18:04:32-0400

@LiverockRocks

Saltyreef · 2026-10-24T18:45:45-0400

I wonder if it could be either one of these. Cant tell if those are spires or nudi flesh.

exnisstech · 2026-10-24T18:58:49-0400

Saltyreef said:
I wonder if it could be either one of these. Cant tell if those are spires or nudi flesh.

Caducifer decapitatus looks like a possibility but if it is I don't know how it got in. I started the tank with Gulf live rock and everything else came from a tank my move from a 3 years old tank.

Hopefully I'll see it again and be able to get some better images.
Couple crops from to original image.

EDIT: looking closer probably not Caducifer decapitatus. This one has horizontal stripes and the
Caducifer decapitatus stripes are vertical.

ISpeakForTheSeas · 2026-10-24T20:08:41-0400

exnisstech said:
Saw this critter in the tank the other day. It was approximately 3/8" long. I didn't touch it so I don't know if it has a shell or not. The tank is a recent move (3 months) and I cycled it with 35lbs of gulf live rock. @ISpeakForTheSeas any idea?

That's a tough one - my gut says some kind of snail as it looks like it has a shell lip on the bottom right side in the pictures and too many odd pieces sticking out for a nudibranch or flatworm, but I can't say for sure offhand at the moment (I'm getting rusty these days).