What is this round orange thing?

[BubblesandSqueak]

So I just saw this orange glowing round thing on my sand. Any ideas what it is? Under blue it glows orange, white light it’s just brown. Looks like a round limpet. It’s about 1/2” in diameter.
Some sort of worm that is circling. Came from TBS live rock. And it’s flat

 

[SnazzyUrchin792]

Can you confirm it’s alive?

 

[kchristensen8064]

It's the door of a snail that died.

 

[BubblesandSqueak]

It's the door of a snail that died.

Wouldn’t have thought of that. Thanks.

 

[BigUgliesNY]

It's the door of a snail that died.

Can you identify this and tell me what is may be??

 

[cloak]

Can you identify this and tell me what is may be??

Sponge. (good)

 

[BigUgliesNY]

Really? Ok, as long as it is not worms. Thanks