Yup- its a red tree sponge-- one of 2. I have a larger one that is about 1.5 ft high--- its really nice. its a pain though, cuase i have to bend it down so i can do water changes-- otehrwise it will get exposed to the air. make sure that when you take it out of the bag that you keep it underwater the whole time.. i know that most times you dont want to get your LFS store water in your main tank, but in this case, you kinda have to. exposing sponges to water can kill them, as it is very difficult once it has been exposed to air to get all teh air out of the sponge- and anypart that stays exposed to air will die.
I will try and get some update pics and post the photo of the large sponge for you later this week....
Joe