Critical Purple Kush - VPD FTW

Not much going on yet. Added some 3d printed supports to make sure they don't start flopping over. Not sure if it's the strain, or my idiocy, but these bastards are soooo leggy. Grr. Watering daily to 15% runoff with MegaCrop 2 part in RO at 0.6EC and 5.6pH. Found Mega Crop gives very stable pH on the right range without any pH up or down needed. Took one day off (3/18) watering to water with Silica Boost at 6ml/gal concentration pHed to 5.4. PPFD 300 at canopy for DLI of 20. PPFD was about 20 for first week while I was prepping and sanitizing the grow room, which might explain the leggyness. If they don't look better after topping, I might pull them and try a different strain. 3/20 - this grow is inspired by the techniques of Bruce Bugbee (PPFD, nutrition, EC monitoring, substrate, environment, etc) and the concept of VPD control, both of which served me very well in the past. The grow room has dual PID controls in my PLC regulating the temperature and humidity to lock in the VPD based on plant age. In later veg and flower, I had CO2 injection on a PID, but that ultimately failed because I couldn't get the humidity down as it got huge. Had too many vent cycles. This year, hope to source or kludge an in-line dehumidifier so I can keep the sealed chamber where it needs to be without wasting CO2. 3/22 no more vertical growth, thank god, leaves and roots are slowly catching up. Patience. EC to 0.7