i just turned my plants over today i need help with ppm numbers during flowering , im using a homade dwc system its my first grow with it . im using r.o. water im adding cal mag my nutes are rockwool formula 1 airstones pump runs once an hr. water temp 69 temp at canopy 78 - 80 r.h.67 - 72% im growing martian mean green any input would be greatly appreciated ............. SMOKR1