Hello, This is my first grow, so I know I know not much at all...so please bare with me. Facts: -600w Metal Halide, approx 14 inch from Tops. -494 CFM Vortex fan cooling bulb -decent powered oscillating fan inside -Temps running 81.2 at the tops -Humidity 41.6 -Soil Miracle Grow Moisture Retaining (i know i read otherwise but my nursery told me it was the best :-( -Nutes : Miracle Grow Bloom Booster (every other watering) -Watering about every other day. I wait for it to droop a little, but the water comes out the bottom quickly am i over watering? -PH: Taken 9 hours after watering : 7.24 -CO2 enrichment: 0.2ppm 15 min 2x a day So i noticed the edges were looking a little burn on some of the lower leaves, the tops look nice and green. I immediately suspected spider mites, and the leaves kinda looked like them, but i don't have a magnifying lense, and i cannot see any of these things. I shook the leaves over a piece of paper, and it didn't look like anything came off... I have 3 plants (white widow guaranteed fem) and the tallest one is the worst, the others have similar but much less symptoms. I can take more pics, but they all seem to come out the same. They definitely seem darker on the bottom of the leaf than on the top. Any thoughts?