HI,
I went to a store yesterday and they had this structure growing on the side wall. It produce a nice thick mat and from that mat is growing many of these structures like they gave me. They said it is a sponge and it does have the texture so I am pretty sure it is a sponge but I would like to find out what it is exactly and if it is photosynthetic or not. Any one know?
The structures like these are around 5" long and there can be quite a few of them growing on a 10" mat. Dunno if it will survive without its mat and the guy pulled it out of the water (I was like eeeeee...). oh well...it was free.
