Late reply but for future googler's - it was nute burn. I went to half of Fox Farm's feed schedule and kept the nutes less than 3/4 of total with my ph adjusters and 110 ppm tap water. The grow came out great and ended up with just over an ounce from these two plants 8 weeks later.
robincog Reviewed by robincog on . Hydro - brown spots and dry leaves White Widow x Big Bud seeds Indoor growing tent 48"x24"x60" Hydroponic Rockwool surrounded by hydrotron Hydro bubbler system, 8 gallon tote with 5 gallons of water, leaving about an inch of exposed roots from bottom of 3" pots Tap water source Source water pH - 6.9 (treated down to 6.2, I just dropped to 5.6 tonight) Source water EC - 110ppm (I don't have a EC meter) 5 weeks old Using complete FoxFarms system and schedule Rating: 5