Orange tree sponge

[Gill_bucket]

I just picked this guy up yesterday. I was wondering if anyone has experience with these guys.

 

[cloak]

I've no experience with them first hand, but I've always heard that they were very difficult to keep long term. Here's a few articles on sponges.

http://www.advancedaquarist.com/issues/april2004/invert.htm

http://reefkeeping.com/issues/2005-06/rs/index.php

http://reefkeeping.com/issues/2005-07/rs/index.php