Critter ID?

[Sophie1213]

The top gets longer. It has the body of a mangrove that's alive? I have no new rocks and have never seen this in my life

 

[Sophie1213]

I took it out to take the pic and put it in just in case it's not bad

 

[Haddonisreef]

Wow looks creepy! If anything just put it in your sump.

 

[Sophie1213]

Hahaha crap I don't have a sump for that tank. It's in there. I'll watch it and let you guys know what it does

 

[Sophie1213]

After some web browsing I can say it looks to be a peanut work, and I guess they eat detritus so it can stay