what is this?

[stevenscrg62]

i found it on the back of one of my rocks while moving things around.

 

[bigarn]

it's a sponge ..... harmless filter feeder. I hope you didn't have it out of the water to long.
Whoops ... maybe it's not out of the water at all.

 

[stevenscrg62]

thanks your fast as soon as I get more pictures of the other stuff that I have no clue what it is you can identify that to

 

[fishhunter]

wow that is a wicked spunge! If you have just saw it then it must like your tank to have grown that big!