Egg Sack?

[fishytime]

try googling images of sponges....some sponges kinda look like egg sacks....

[btymens]

Originally Posted by fishytime

try googling images of sponges....some sponges kinda look like egg sacks....

I've never had any sponges in my tank so I can't see it being that..but time will tell though

[Myka]

Pretty much all reef tanks have sponges...they like to be in the dark so you don't usually see them on the rocks. They are usually in shaded areas or in the sump/overflow box.