I notice this, too. I have gone to three shorter periods of fans each day.
I had a jalapeno and an orange hab hook up today so I'm 4/4 with them as well. The fan appears to be doing its job... the seedlings were all quivering when I first plugged it in, but half of them are standing firm now. With the fan blowing over the plug tray the cells seem to dry out fairly quickly. I have to water twice a day to keep them from wilting. I have the fan on the same timer as the lights so when they go out for the night, so does the fan.
Edited by PaulG, 26 February 2012 - 03:51 PM.