Alright, I know that plants will drop their leaves in the flowering phase but, they seem to be turning wrather fast... like the bottom 1/3 of the leaves.

Im using sunshine pro mix for soil
open sesame, beastie bloomz, cha-ching (fox-farm bloom 3 stage)
1000w hps and 400w hps 12 trees

Is this perfectly normal and Im just paranoid or am I missing some nutes???

ps the color of the leaves is a very pale yellow.... no curling, no stunting, no deformed growth, just hella yellow leaves..

thanks in advance to all opinions or facts