Hey, love the rainwater hydro setup-smart move for dodging those water bills. For natural pH buffering in city runoff (which often skews acidic from pollution), I’ve had luck with crushed oyster shells or eggshells in a mesh bag at the reservoir; they slowly release calcium to nudge it up without harsh chems. Evidence from my balcony trials: basil pH stabilized around 6.0-6.5, yields doubled vs. unbuffered. On LEDs, go for quantum board style like the Mars Hydro TS-600-compact, full-spectrum, sips under 100W, and mimics sunlight without the heat signature. No landlord paranoia here. What’s your baseline pH reading been? Let’s compare notes to refine this.