I really appreciate the info!
aarone, I took on out, cut it open and they are full of dirty looking water. Kind of a tough, thin, plastic like shell and definately not just a bubble.
NM reef, thanks for the advice. I have one Emerald Crab and he spends most of his time picking stuff off the trunk of my mushroom leather and it probably would not hurt to throw a couple more of those guys in there.
ClarkiiBoi, really silver looking could just be the reflection from my PC's but I would guess it was green bubble couple of the small bubble's look green? Taking out my rocks is really tough, I like to stick my coral inbetween two rocks to hold them. I will try the really carefull approach and prey I don't pop any.
thanks everybody.