Yellow thing with two coral frags

[Wilbert]

Hi everyone!


I just picked up two new frags for my tank: a red mushroom (Discosoma) and a frag of GSP.


When I unpacked them, I also noticed a small yellow rock included in the bag. It looks pretty cool, but I honestly have no idea what it is. Does anyone recognize it? And more importantly, would it be safe to put this in my tank, or is it something I should avoid adding altogether?


Any help would be greatly appreciated!

Thanks,
Wilbert

 

[Tahoe61]

Sponge?

 

[56longroof]

Looks like a sponge to me.

 

[Wilbert]

Thanks for the replies! If its a sponge, it can be a harmless addition to the tank, correct?

 

[56longroof]

Thanks for the replies! If its a sponge, it can be a harmless addition to the tank, correct?

100% harmless