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Salt build up in the root medium. What is the run off ppm?

Looks like a mg deficiency, add 1ml of epsom salt per gal. to your nutes to start with and maybe foliar spray with 1% epsom salt and water solution. Should see recovery within a week.

2000k will work the best. The shades will work great. Temps seem perfect.

What is your ppm at?

Looks like a magnesium deficiency, add some epsom salt to your nutes at 1 tablespoon Epsom salts/gallon of water, or foliar spray with 1/2 teaspoon of epsom salt per litre on affected areas, which is what I tend to do. Keep your flora at 1-2-3 ratio but bump up ppm a bit. Not sure where you're...

Thanks for the reply Mazar. I was just using straight GH at 1G-2M-3B ratio. No boosters. I ended up bumping up the entire nutrient strength to 1400ppm, drifted down to 1250 over three days, and the problem hasn't gotten worse and is slowly getting a bit better.

silverstar 8" aircooled with 1000w hps. There about 18" above the tops.

My problem is yellowing tops and on some right down to the buds, I have been feeding with GH 1-2-3 for the last two weeks and am in week four of flower. The damage seems to be occurring under the light and when moved away begins to green up again. Nutes have been between 1050 ppm and 1400 ppm...

My problem is yellowing tops and on some right down to the buds, I have been feeding with GH 1-2-3 + 1ml gal flouralicious plus for the last two weeks and am in week four of flower. The damage seems to be occurring under the light and when moved away begins to green up again. Nutes have been...

So giving a feed on nitrogen took away the yellowing bud?