Can anyone tell me what this is ?

I have discoloration on leaves .i am using pro mix soil less mix, earth juice nuts and distilled water.at 1/4 concentration every three days temp is 71 to 81 400w mh can anyone help me see pic. started nuts at day ten

You shouldn't need nutes just yet....that may be your problem.

Overfert. Definite nute burn. cn

I'm using organic frets and soiless mix don't have any nuts. i treat it like hydro.But i guess you could be rite thanks for the advice .

Don't forget its just a plant! Don't try and over do it.