corals dying?

[Snappy]

I hear a lot of talk from people having problems with their tank that can't seem to get diagnosed. I got to wondering since the parameters all seem to be within range, what causes these problems? Here's a thought/question......How many people that get sick coral, particularily sps, smoke in their house or around their tanks? If you answer yes, I would suggest that this might be at least part of the problem as you are polluting your tank. There is a lot of air getting sucked into the system via skimmer pumps, etc. so it stands to reason that it would have an affect on the health of ones reef. Any thoughts?