What's on my snail's butt?

[alyee5]

My eagle eyed daughter (future marine biologist?) told me that one of my cerith snails seemed to have an anemone on its butt. I couldn't see what she saw until tonite. I took him out of the main tank and put him my sump to get a better look. Picture below.

Any ideas? Harmful? Should I scrape it off? I am very curious, should I wait and see what develops?

 

[Tahoe61]

Looks like an Aiptasia. Superglue over it or rub it off thoroughly.

 

[Vaughn17]

I don't think that that end is the butt end, lol.

 

[ahiggins]

I don't think that that end is the butt end, lol.

hahahahahah
It does look like a baby aiptasia. Youll definitely want to remove any trace of it.