I'm pretty sure it's a sponge but, and not to give Nook anymore ammo but, the lump itself is white/opaque the threads are almost invisable and the the orange balls float at the end of the threads. I have never seen anything like it before in any tanks or when I was diving. I will try again to get a picture but it's hard to get due to the location and my crappy camera. Thanks John.
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Robbie
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