OK, here is some info and specs on my grow area and setup to help diagnose problems, i am running a 400 watt MH?HPS system currently MH for veg, air cooled, i am growing in a home made DWC rubbermaid setup after having good results with rumplebuckets, the temps stay 74-79, PH is always jumping, like from 5.5 before bed and high 6`s when i wake up, it seems to be slowly be getting steady, it shouldnt be PPM as they are very young and i havent fed them anything yet, just tap water changed every week or so, until i get on the lucas formula, i dont have anything to measure humidity, could lack of humidity and ph swings cause this?
hope this enough info
thanks city