Id

Fellows I was unable to find a thread for ID specimens , I got this at the LFS and I was told it is a "blue photosynthetic "I was unable to find anything that looks like it , the thing is it started purple when I got it then got bluish now is slowly fading to what it seems white,it is growing fast though!! current placement is top of tank under LED ocean revive unit, and strong flow. Parameters are under normal range any ideas what tipe of sponge (coral) it is to give it proper care.

Thanks in advance

IMG_1756 by aztlan67_rs, on Flickr