Growing a Bruce Banner autoflowers in a mixture of organic soil (not miracle grow) peat moss and vermiculite. Water with fox farm tiger bloom mixed with water (1/2 to full strength). Ph of water going in is 6.5. Started to have some leave discoloration. Found it could be a ph issue or nitrogen issue (ph related). I checked the runoff and it is between 7.7 & 7.9. I flushed with water below 5.8 ph and got the runoff down to 6.8. In the future should I be watering with ph lower than 6.5 to keep my runoff from being too high? I use untreated/unfiltered well water which has a high ph (close to 8) and use ph down to adjust.
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If you stick with soil I’d water till run off with RO before you plant and see the values of your medium. Flush accordingly and ph accordingly going forward.
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It does lean towards a PH issue. Do you have a meter to measure runoff? Autos are very finicky about nutes. I would start with about 1/4 strength of nutes. Check your PH after you add your nutes. Also you might want to add a little cal/ mag to your schedule. A little goes alot with autos. Is there anyway you can filter your water? Maybe fillnup a couple of buckets and let it sit out for 24 hours? Edited ( im stoned, forgive me or join me ) but just realized you answered one of my questions.
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you should be feeding Grow big as well, she’s hungry for nitrogen 
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Big Bloom too, as it contains the micronutrients your plant needs. Are you also using cal/mag? Calcium and magnesium are not included in the FF Trio.
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