The suns are in one large piece, but in 3 groups. The middle is actually a very large clam (about the size of my fist) with the 2 smaller sections on either side. On the underside of one of the smaller sections I found this guy. At first I thought clam, but after watching the whole thing move (shell litterally moving itself) to where it had access to the opening, I no longer think its a clam, but another barnacle. I've got a few barnacles, only this would be the biggest by far.
Also, found a baby snail higher up in the tank