Zoa hitchhiker?

[TomSerious]

Hello!

I added 6 Zoa frags yesterday and dipped them all in "The Dip" from Fauna Marin before putting them in my tank.

I noticed something on one frag, I think it's some kind of sponge?

Today, all, except the frag with the "sponge" are partly or even fully open.

Can someone tell me if it is a pest and should I remove it?

It has a porous structure and 2 little "tentacles".

Sorry for the bad pictures, if it's unpossible to identify, I could use the camera of my wife for better pictures.

Thank you in advance!!

 

[Crabs McJones]

Looks like a sponge of some sort. Should be harmless but if your zoas are annoyed you can remove it.

 

[Sosuke]

Looks like a sponge of some sort. Should be harmless but if your zoas are annoyed you can remove it.

+1 I had a coral growing a sponge on the frag, though the coral was not annoyed at all I still had to dip the coral and the sponge died from the dip. I would only do that if the zoas won't open though