I have had gold or yellow tips on my leaves, my water was ph was high and I tempered it to the 6's with lemon oils 2 waterings or 5 days ago with no change. My plants are in their 6th week and otherwise look great growing more than 1" in height each day. Also, it is not spreading down the leaf. These girls are getting ready to blossom and if this isn't going to get worse I would prefer to ride it out than upset the plant more. I don't have a good picture but it is only on the tip. I have half a mind to ignore this as everything else looks good and see no reason for my nutrients to be out of balance because of the hot soil method I used rather measuring and feeding through the life cycle.