It is a highly toxic sponge!!! I am one of two people trained to handle this type of sponge.I will be over shortly and remove it and the zoes and the rock. Lol it does look like a sponge any chance of a closer shot?
ansley do not put you hand in the tank i repet do not. i am the only one trained to deal whi this. i can not tell you what it is. its a on a need to know base and i will come get it out of your tank asap and then you will not need to know just know that the zoa's and your rock will be ok in my tank!!!:yes::yes::shades::shades:
That's funny, I have a yellow sponge that came out of nowhere from a zoa frag I got from Rit. The wife likes the sponge better than the Zoas but now I have to find a way to take a frag off that rock without exposing the sponge to air.