Are you sitting down? Just kiidding...well live and learn. I will try and help you figure out what is going wrong, but 1st.

You say you are doing rubbermaid and everything is done right...Well explain it to me please?

You say you nutrient ppm readings are low enough not to have problems...clearly you have problems. So, we need to start form info/scratch...OK?

ppm/ec meter...make/model?_________________

tap or distilled/ro water?____________________

what ph is water before nutes?_________________

ph meter...make/model?____________________

ph after nutes mixed?________________________

how do you adjust your ph?_____________________

what kind of nutes are you using?___________________

how do you mix you solution?___________________

what additives?____________________

are you growing in a box...a closet....a room?_________________

what kind of lights?___________________

location of ballast?_____________________

exhaust/ac?_______________________

room temps?_____________

canopy area temps?_______________

answer these for me and maybe we will find something. peace later