Tomorrow I am starting to use Distilled water for all my watering. I will run with that for a couple weeks and see if I see any changes. 9i really dont think this is it.. I think its a soils related nutrient situation) after tons more online research the closest thing I find is a "Potassium deficiency", BUT how I have it using a PH water at 6.8 (was 7.6 before last week), and using the Foxfarm soil without adding any nutrients is the part that has me stubled. (if it is in fact Potassium Def.)

A few things I can eliminate.

1. Heat Stress. I have took a temprature reading at the lights in several locations (just using T-5's now) and it is 73 - 77 degrees. I am able to hold my hand above the plants for as long as I want without any burning issues at all.

2. Overwatering. I know plants enough across the board to know that isnt the issue when I consider the amount of watering guidnance that says to water until some water comes out the pot bottom holes. (underwatering may be a issue, but I dont think it is the cause)..

I have taken some higher quality pictures today of the plant that has issues top to bottom, and 2 other plants that have a leaf or two that show similar signs.

Yellow leaf tip on new growth followed slowly by it turning brown, and spreading along the outer leaf edges.. evenetually the leaf becomes hard, and will break when bent.