Well Same Idea but you need the stuff available at the hydro store.. It will cost more and this shit u do not want on your fingers or hands... Remember when u put the stuff in your water, u should let the water set 20Mins before adding your nuts and water right always since the extra molecule is radical and will dissipate right away. I dont know if it is worth the money!! They clam board leaves but u need it right from the get-go!!

It kinda looks like your plants are in their growth stage in flower-if thats so than that could compensate for why they have under gone some stress by your heat of the bulb.. Check out if your leaf tips are burnt as well, if so that would indicate nut burn. But prob not if you are going half strenght and your plants are that mature...