I have been staring to notice these things on my rocks. I have no idea what they are. They are kind of clear looking, but they do not appear to be moving or anything.
I have tones of then my tank in the darker area's like in the run-off box and places like that. I am not 100% but I believe they are either a type of Tunicate. They are filter feeders, and cool to have (IMO)
