Went ahead and tried out the air pump idea. The airpump I got has 2 outlets so I stick those into water bottles and stuck a bubble stone on each. Then have a line coming out of the top of each bottle and into my terrarium. So far hasn't made any appreciable difference. Maybe I need to put both lines in one bottle to increase air pressure. I'll tinker with it some more. Any pointers?
I can't seem to find a thread on this on these foums but I know I've see one before.
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I was concerned that something like this would be overkill and create too much humidity. Maybe I'll have to look into that.