Growth tips look like there growing again and the temperature with the light on is only 77 °F and with the fan blowing that keeps the HLG light really cool, I can say the HLG 250 stays very cool with a small blowing on it. Im thinking its something to do with 2ml/gal AB being to hot for the metabolism and purple on the leaves in the low 80's, flushing and dropping to 1ml/gal ab seems to be a solution what was causing that. I couldn't say for sure what it is. I hope this wasn't a problem for any other gardeners, it was quite costly trying to figure it out. I was somewhat disappointed with the fact that it was because I liked indoor gardening, it really is an expense for a few months if your spending on a light per month and the heating can be expensive if your heating for 24 hours at 1500w.