Unknown snail/nudibranch/polyp

[IceNein]

I have this weird critter that has been hanging out on my glass. Source is from TBS live rock/sand. This guy is maybe 50% larger than a cooked grain of rice, so it’s hard for these old eyes to get a good view of it. It moves around on the glass like a snail, but slowly.

When I first saw it, it seemed like it had a little rough shell, but when i zoomed in my cell phone it looked like little gills a nudibranch might have, but now when I take a picture it looks like a polyp of some sort. Maybe some sort of anemone?

 

[NonstopSoda]

Might be a glass ball anenome? like a small baby but im not sure.

 

[BristleWormHater]

Looks like a ball anemone or cornactis mushroom to me. Pretty harmless cool little hitchhiker.

 

[ISpeakForTheSeas]

I have this weird critter that has been hanging out on my glass. Source is from TBS live rock/sand. This guy is maybe 50% larger than a cooked grain of rice, so it’s hard for these old eyes to get a good view of it. It moves around on the glass like a snail, but slowly.

When I first saw it, it seemed like it had a little rough shell, but when i zoomed in my cell phone it looked like little gills a nudibranch might have, but now when I take a picture it looks like a polyp of some sort. Maybe some sort of anemone?

Yeah, that's some kind of anemone.