mg deficiency or over fert..

hi i have a problem with my girls..i am not sure if it could be mg deficiency or i have been to 'good to them'..i hope some of you guys can give me a hint..
i use ro water in hydro and my ppm is falling and ph rising..when they eat of the ppm can it then be over fert?..i heard that using ro you NEED to use cal mg..i have the 1 from an..how much of the ppm should the cal mg be?..my ro water have 2-6ppm.

i hope some one can help me to correct this problem for my girls.
thanks and stay high

my plants look like that too, i think it is over fert

in ed book i am reading now if you do ro u should always use camg it helps buffer the water so u can acheive better ph and nute uptake. so it say

It looks like an mg problem to me. I always have a hard time determining if it is too much or too little. Sometimes that leaf curling can be caused by excessive temperatures as well as an mg deficiency so watch out for that as well.

Really looks like over fert. What is your ppm?

magnesium.......my vote. nute burn would effect edges first; this is diffuse.

It could be either, but a quick check of the ppm should rule out or confirm the over fert.

here check this out http://www.thcfarmer.com/forums/f57/complete-guide-sick-plants-ph-pest-troubles-999/ to see what you can come up with, hope that helps.