Sorry for the late reply (I am actually on break during a two-week vacation.) My regime is totally controlled by a combination of ambient room temps (mine is in cool basement) plus a fan that runs through the t5 bank to exhaust the heat before (hopefully) it gets into the tank. Right now (afternoon and t5s have been running approx 6 hours) the tank is approx 20C - this represents highest it will get during today. At night after lights shut off the temps will drop to approximate room temps. My plan is to open basement windows at night during summer months and run room fans to help lower basement temps. I will shut off windows when I get up in morning to trap cooler air in basement. My terrarium only runs 15C at night and only when basement temps are approx 15C. Hope this helps.
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Masdies, Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)
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