Im not to sure..i had gnats and was told to drench the plant with it..so like a idiot i drenched the plant with the lights on..i figured it wouldnt hurt cause im using 40 watt floros..But come to think of it i dont think it was caused from the spray..its got to be something else..my clones have been in the ebb flow system for 3 weeks and they were doing just great..all of a sudden then leaves started rolling really bad but still really green..fan leafs are crispy and discolored..i have no idea whats going on..what ppm should i be at with gh nuts? thanks for the reply