I have no way of knowing the ppm maybe if i read the label on the nutes... I just did and didnt find anything on the ppm. The solution may have reached the leaves via the drip ring, it gets the floor wet? One of the plants has had splotchy spots on most of the leaves but the spots are just a lighter green color so I pay it no mind its always been like that. I hope its nothing that can spred to the other plants!! I cant take any better pics till later when i go and turn the lights back on. One more thing every seince I put the lights closer, the plant dosen't hold up the leaves the same, they look droupy?