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why would ph down work better than vinegar? I experience similar problems myself; ph is above 7 for sure when i come home from work

No. Tap water; there are two active airpumps in the tank as well to provide plenty of oxygen

I have an issue, i have two plants and one is exhibiting an extreme yellowing in the leaves while the veins stay green, but there is no red on the stem. They had started to develop necrotic, black spots on the tips and soon inward; the leaf has since dried up and it came off w/o force today...

i thought once the buds were filling up that you shouldn't foliar feed? also i would say check the humidity, should be around 40%-50% when flowering to avoid botrytis (bud mold, grey mold)

so I've got a setup of plants that is in a DWC i self made, and the bottom leaves of the plants are turning a bright orange-yellow. They are just entering the veggy stage a few days ago, and the cotyledons (1st set of leaves, the round ones from the sprout) turned bright orange, and got crispy...