Dancing with the Devil in pale LED light

1st time novice grower in the Northeast with 600w Yintatech amazon shite using Miracle Grow "premo" potting soil (non moisture control version). The 2 D.Devil auto seedlings are lovely and lush green though growth appears slow. Filtering via ZERO water. City tap pH ~7.18 tDS = 130. Post-filter reading of 6.1 pH with a tds of 000. The girls are currently in 1 liter plastic containers which i feel may be too large and not wicking moisture away fast enough but it doesn't seem to be causing detrimental effects at this time. The Yinta kit came with 2 fabric grow bags about 2-3 liters in size, so a bit bigger than their current containers which I hope to be transplanting after a couple weeks of veg. After reading a bunch of articles on Royal Seeds regarding nutes versus indoor autos, im going to hold off on any additions until after the transplant happens. At this time im sitting on 5 total additives, pH up/down & general hydroponics' Flora Gro, Micro and Bloom kit. No funky fertilizers, no rooting additives i really want to see how the first 2 girls fare without bombarding them with chems. As for the staging area, they're currently leisuring away in a spare closet with the Yinta. House is pretty stable around 65 +/- 5 degrees F, day or night with good natural cross breeze. Within the next week or 2 I will be piecing together their main housing , my own interpretation on a stacking space tote design. I'll be sure to post the details and final cost as the build progresses. **Edit: Sept. 7th** After the past few days with little to no significant growth, I decided to set up a small space heater going at 70 F. It's about that time of year in the NE where there's a slight chill to the air in the early morning so my initial thought was perhaps its a metabolic rate thing due to low temps. Fingers crossed that the extra warm air circulation will allow the soil to dry out more quickly as well. ✋💀 Best regards, S