I think the pink is a form of algae or sponge. I have it growing in places on my rock. I also have black patches that are growing in the back of my live rock that I think are some sort of sponge??
Yeah the red thing is really hard and its not covering the rock, it is it's own thing. As far as the "sponge" that is the largest spot where its growing, I can visibly see 3 others.