great stuff dan, the tank is gorgeous!!!
on your id q, the brown thing on the left are just brown button polyps. i had a few wo the green center that jsut grew out of my live rock! to the left of that looks like either a goniopora or alveopora. you can tell between the two because goniopora has a golfball shaped skeleton, while alveopora is branching, however both are very closely related!
good luck, i love the red shrooms!
jon