AIR in LR?

[matasw]

One of my pieces of live rock has about 2cm slit in it the height of a razor blade. There is something shiny looking in there like a piece of metal or the glimmering of an air bubble. It looks creepy so I decided to shove a razor blade in there. I looked closely and you could see it bend in as if you were poking a piece of jellow but it didn't wiggle :) So i jabbed the blade in there real hard and started moving it around, some air bubbles came out. However the little thing i see in the rock is still there. Any idea what this might be. If it were an airbubble wouldn't the knife be enough to punture it and make it dissapear.

[Shagsbeard]

Air doesn't just "dissapear" (sic). You might dislodge it and have it float to the surface, but it's not going to vanish simply because it was cut.

I'd say let it be, unless you start seeing discoloration. If your rock turns blue, or red, that could indicate metal corrosion. As always... give us a picture if you can manage it.