My build threads are summarized here:
viewtopic.php?f=36&t=8875
I actively vent my vivs. This build thread summarizes my venting experiments with data loggers:
http://www.dartden.com/viewtopic.php?f=23&t=7420
I tried internal circulation fans but opted for active venting. I use turface mostly as my substrate with pockets of ABG For my plants. I mist via a mist king 4 times per day for 30 seconds. That allows my active venting. I use a variety of jungle dawn bulbs in custom built hoods.