Yellowing in flower

[MrAmnesia]

@Waira ive just read through your oh sticky , using the formula on there this is what ive got:
Water going in 6.8
Run off 5.6
Soil ph= run off - difference
Difference = 1.2
Soil ph = 5.6-1.2
Soil ph= 4.4

I understand this is really acidic and could be contributing to certain issues im having , if i was to increase the ph going in then im suspecting this will cause the run off to be a higher value or worst case stay the same which will the create a larger difference thus giving me an even more acidic soil
Not sure on how to tackle this

 

[MrAmnesia]

Been looking at the dolomite lime again , i know its best to add it before planting so it can be mixed in ect. Got 3 more seeds to drop soon so may get a bag and drop some in , ratios im seeing are around 1 ounce per gallon of meduim..
For the current grow can i get away with hydrated or powdered dolomite lime? Is so what ratios should i be plonking it in at

 

[Waira]

get me fresh pics mate, so I can evaluate,... this is why I hate the r-o method,.. I have serious doubts your soil is this far off pH, 4.4 is meltdown zone! I assume you didn't pH the water, and used RO/DI on the final pour? Even tap water, if sufficiently hard, will add buffering capacity, and skew the results,... limes are not the answer at this point, especially dolomite, which is the slowest acting of them all due to a different molecular arrangement in the Mg/Ca carbonates,... pH up buffered water is a better choice, but first, pics,... your best choice for in-soil pH measuring is a soil, pH probe, like the Accurate 8, or a professional fancy unit =$$ ,... I hate to keep soaking-out you plant too, this close to harvest,... even if she finished looking like hell, face first, it's the bud that matters most!