Problems...

I am seeing [color=#8b4513][b]brown patches on my fan leaves[/b][/color] and the edges of the leaves are turning up just on the edges. The top fan leaves on the plant are more [color=#ffd700][b]yellow[/b][/color] than I assume they should be or have been in the past on new leaves. Im running a 4000 Watt SH, FF soil. Mystic Grow Nutes for 2nd week of Flowering. Water is RO and usually at a neutral PH. Soil usually comes up just under 7.0 and rarely goes over that. Ive got C02 in the form of an ExHale bag and ive been adding Unsulfered Molasses to my water for the last 4 days. Nutes are added every three days, Fresh water the following night after nutes and I let the soil dry out on the 4th. Day time temp fluxes between 86 to 89 Night is 75 to 78. [b]Please feel free to comment if you know how I may correct these issues :)[/b]