Hard to tell...picture is a little blurry...sponges can take on a variety of shapes, if you can get a clearer picture it would be nice..
It doesn't look like this though does it.... http://images.google.ca/images?hl=en...-8&sa=N&tab=wi
Sorry I couldn't resist....
I thought it was going to be a link to Seinfeld. I wonder if his tank is sponge-worthy?