I have read in this forum that dry ice can be used in a terrarium to control pests. I am very nervous to do this. I found these instructions from a dry ice company and wanted to run it by other orchid folks to see what you guys think: Cleaning Terrariums - Airgas(R)
Is letting the CO2 sit for three hours enough?
I'm also not sure how much to use for a small enclosure 12x10x18 and a larger enclosure 24x20x14 (20 gallons).