So when I bought my new to me tank it came with all the rock and live stock. Once we got it all set up I noticed some kind of sps encrusted on a really big rock, it was in pretty rough shape when I first got it but since hasn't really taken off. Wondering what the proper name is for it?still learning sps names and how to tell them apart.1st pic was they day we set it back up and the 2nd is how it looks now 1 1/2 months later