what is this

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tjk971

Member
Joined
May 17, 2010
Messages
18
Location
Sumner, WA
I have a little black sac of something growing on a rock in my tank. Its about as round as a pencil eraser. I think it an egg sac but not sure what kind of eggs. Can anyone help.
 
Hard to tell what it is from the pic, but my guess would be a sponge of some type. I have some blackish sponges in my tank that grow in a pretty much round ball on the rocks.
 
My guess is that it is a sponge as well. I have had black sponges in my tank before too.
 

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