ive never run aerocloners for 24/7. Theys just to much moisture. I run 15 on and 15 off. The humidity stays great in those 15 minutes. I know people that run one hour on, half hour off, or other combinations too. But I dont know anyone who does 24/7. Also, dont submerge the stems. I also start with the water level below. Just below, but below. If your using netpots, then they should just sit in the water.