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When I flushed I took some pH readings using general hydroponics' liquid pH test. My tap water was 7.5 or 8 and the runoff from the plant was 7. I also took a soil sample and used it with a rapitest soil ph kit. It also showed 7. Could my pH be too high? Hopefully they just needed a good flush.

I didn't think it was light burn either. Turned the ballast back up. I always let the soil dry between waterings. Next time I'll flush and add a little dolomite lime. Maybe reduce the tiger bloom and I ordered a PH test kit. Also, they've been in the same five gallon pots for a little...

Thanks for the replies. I didn't think it could be light bleaching since i've got a foot between the light and canopy and temps stay under 75. I dimmed the ballast so hopefully that'll fix it.

This is my first grow and I've got a few mainlined plants indoors that I started from bag seed. I'm in week 5 of flower and the leaf tips of the new top leaves around the colas are yellowing pretty badly and curling up at the ends. I think it might be a zinc deficiency but I'd like a second...