"Peter Pan" wrote in message Good luck with your
tank, sounds like its progressing nicely

Thanks. The thing is---most of the time I dont know what I`m really looking
at. There are some soft things coming out of the rock. Some look like what I
would think are "sponges" but I really have no idea.
BTW---how do clams grow? Do they shed their shells? Or do the shells grow
with them?