I've had my plants for just under a month now and recently they've been showing yellow on the ends of some of the leaves. The leaves not only on the top, but some down lower on the plant aswell. They're also showing a little white on the leaves, almost as if they're drying out. I run 2 200 watt cfls and one 150 watt. My temperatures are between 77-80 with the lights on and about 70-74 with the lights off. The water I use is from the tap, but I let it sit two days before use, letting a little water pour out from underneath the pot a little bit. Does anyone have some suggestions as to what this might be?