Hey guys how’s it going? This is my first post here as well as my first time growing; I have been reading and looking around for a little while. Here is some background information: I have six plants in soil, five of them are White Widow and one is Jock Horror. All plants are from seeds and the seeds are from a reputable source. All plants are in day 33 of the veg stage, the light regimen is 18/6. I have a 600 Watt light that is about 18 inches from the top of the tallest plant. They are watered once a day, always in the morning. It can get from 70-95 degrees under the light. The tallest of the plants is about 8in the smallest is about 6in. My problems are: The bottom (older) leaves are yellowing but the newer ones look fine. What’s wrong? When you look at the pics you can see some browning on the tips of some of the leaves. What’s wrong?