I have yellow spotting on most of my fan leaves, I'm thinking mag deficiency. These are Purple Cindy in DWC. I'm using Sensi Bloom A + B in RO water. I was thinking Sensi line had mag added. I keep ph in 5.5 to 6.0 range.

Any thoughts??

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doesnt look like a mag too much, i would say nute burn, did u just increase nute schedule?

you are flowering.....leaves will turn yellow.

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No I'm running nutes at 1000 ppm, because I had trouble with some nute burn last go around with this strain. The yellow spots are more pronounced to the eye than in the pic. They have been in flower about 4 weeks.

hmmmmm then i guess well scratch nute burn. week 4, i swear something weird always happens at the beginning of week 4 as the plants starts putting all its energy towards the buds. hmmm, whats your nutrient regime?? are you using a 1 part or a 3 part? also have you increceased/decreased watering recently? another thing to think about is heat? whats your temps like? i see a lot of leaves cupping down, according to what ive read, seen, heard, usually meeans under waterd, the plant cups down to conserve water, and leaves curl up when there is too much water.

If you still think its a cal-mag def., 1st things 1st, check your water source. see what the ppms are at right out the flaceut. also it wouldnt hurt to test your water nute levels with a tester kit. I know where i live, out the flaucet i read 160ppms, and our water is also lacking calcium and magnesium. since i grow now only in 100% canna coco, i have to add cal-mag nutes.

Another thing i just thought. have u left your water to sit out for a day before it goes into resevoir???? chlorine in the water makes weird things happen.

I'm using Sensi Bloom A + B in RO water. I pretty much have been topping off the tub every couple days with ph'd RO water and change the tub every couple weeks. They are under an 1000w with an air-cooled hood and temps never get over 80. The light is appx 20 inches from the tops.

They have seemed to stabilize the last few days at a 1000ppm and some epsom salts added.