Possible Magnesium Deficiency?

[purpleskunk777]

My 2-3 month old clones are experiencing yellowing of new growth. The yellowing is localized on the perimeter of the leaf, leaving an arrowhead-shaped darker, healthier green in the center of the leaf. Researching google, I diagnosed this as a magnesium deficiency (whether I was right or wrong) and followed the directions posted under the sticky "epsom salts = not miracle cure)," spraying the leaves (yesterday and today). The condition seems to have become worse since applying epsom salts. My guess is that when I flushed my plants a week ago, I leeched out one or more micronutrients, just can't figure out which one(s). In addition, the newest growth is very light greenish/yellowish and looks "blotted." I will post pictures later tonight, just wanted to get this up ASAP...any ideas??

Here are the specifics:

Grow Medium = Scotts Topsoil (contains peat) + Vermiculite (80%/20%)
Location = Indoors
Nutrients = Miracle Grow All Purpose (1/8 tsp/gal)  (this is ¼ recommended dose)
Rate of application = Water â?? Feed â?? Feed (then repeat). Plant was flushed with water quantity equivalent to pot size once a week ago
Runoff pH = 6.2
Water source = Tap Water is pHâ??d from alkaline to 6.5
Age of plant = 2-3 months
Lighting source and distance from plant = T5/55W/10,000 Lum/6400K/ Within 6â?� above canopy.
Air temperature = Daytime 80 deg. Nighttime 75 deg.
Air % Relative humidity = roughly 50%
Lighting schedule = 18/6
Type of ventilation = 4â?� inline fan (170 cfm) + 12â?� regular (circulatory) room fan
Did NOT pre-soak media in pH corrected solution

purpleskunk777 Reviewed by purpleskunk777 on 09-11-2010. Possible Magnesium Deficiency? My 2-3 month old clones are experiencing yellowing of new growth. The yellowing is localized on the perimeter of the leaf, leaving an arrowhead-shaped darker, healthier green in the center of the leaf. Researching google, I diagnosed this as a magnesium deficiency (whether I was right or wrong) and followed the directions posted under the sticky "epsom salts = not miracle cure)," spraying the leaves (yesterday and today). The condition seems to have become worse since applying epsom salts. My Rating: 5