OK, here are some new pics. The first one is the 'shrooms. The red one is obvious and the translucent/pink one is to the lower left of the red. It has gotten significantly larger since it first showed up. The second is the tank as a whole. The third is the side of one rock, don't know what the white thing is, it is not soft, it is more like a barnacle, but not round like a barnacle. I am assuming the red stuff is coraline only it is raised. There are several patches of it on the rock.