Western_reefer
Reef keeper
I was looking at my tank, as always, and I found some black sponge!! I've never seen black sponges as hitch hikers! I got quite a bit of it too! It looks EXACTLY like this pink sponge below, just black.

Awesome lets see some pics of it
Be careful with the black sponge I know a few people who lost whole systems to it. It can take over if not watched.
Some were just as big. Have a read of this here.
Does it look anything like this guy?
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Yeah, it was originally a hitchhiker in a local guy's tank. It grew into that from a little 1" frag in about 5 months.
Each barrel/tube is about the size of a fat man's finger, give or take.
Probably around three inches long.
I have the pictured sponge, bought a sm piece and now it is all over. Not your typical sponge though, as I have stated before, you could put it in a blender and then leave outside for 3 days in the rain and it would still come back. It was sold as a black sponge, but appears dark blue to me. If you want some PM and I would be happy to send you some, if you pay shipping.Nice!