Hey guys, Hoping you all can help me once again. Growing Tahoe OG, clones taken from a mother plant from seed. Cali connection. Currently growing under 1000 watters and doing multiple strains but I'm ONLY having problems with my tahoes. I wanna nip it in the bud before it gets any worse. Here goes... STRAIN: Tahoe OG MEDIUM: promix hp mixed with ffof LIGHTING: 1000 watt hps TEMPS: 74 on 66 off NUTES: Sensi Bloom 1.3 ec or roughly 880ppm (700 scale) PH 6.4 WATER: RO w/calmag LIGHT DISTANCE: 12-15" In week 3 of flower. Have been alternating between feeding and watering until 20% runoff. The problem I'm having is the upper fan leaves on Tahoe # 1 are yellowing out and they shouldn't be. They're getting plenty of food. I use RO water and add calmag every watering whether I'm feeding or watering. They're growing well, putting on weight and frosting up well. But the upper fan leaves are yellowing. My first inclination is to say a PH issue but my ph meter is brand new and my ph has been right at 6.3-6.4 every watering/feeding. I also suspected overfeeding but I have zero clawed leaves and no burned tips or edges. I'm stumped. The only other possibility I could come up with was light stress. Perhaps the light was just a little too close? Made by Milwaukee. Are they just heavy feeders? Do I need to kick up the ppm's to 1100 or so with this strain. I have no clue what this could be and will seriously appreciate at help you guys can offer. *** Remember, the yellow is at the top fan leaves. The bottom leaves are green and healthy. And it's only a few leaves here and there. I don't want it to get worse.