bottom leaves browning.....

im growing nl. a strand from back home, the most dank weed ive smoked...lol...

i have3 plants, cfl grows, from seeds. there all doing well, vegging for 3 weeks now. the problem is:

my biggest plant(about 18 inches), has started getting copperish brown on the bottom leaves(3 finger), it didnt start at the tips, just kinda appeared on them like camoflauge,lol, i transplanted it from a 1 quart pot to a 5 gallon bucket, about half peet moss. im worried because its spread to the next branches(5 finger), im scared it will continue up to the seven finger leaves, nearest the top. i dont belive its the moisture level, i only water every 3 days or so, and i doubt its the temp, its cool in my room, about 75, with a fan. someone suggested epsom salt to me, and with the nitro from the moss, recently added, im at a loss......... please help. ill try to post pics, i know its hard to give advise w/o looking at it.....
thanks a million!!

Some pictures would be handy!!

Here is a link to the "Nutrient Disorder Problem Solver" by Jackerspackle.

But it sounds to me like you might have a bit of magnesium deficiency.
Does your plant look at all like this?

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If you don't find your answer on the problem solver, check out my boyfriends Grow Guide

Peace

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hahaha......yes it does look like that. i transplanted it from a quart to a 5 gal pot. i hope the added soil and peet moss will help. is there a way to just add that nut???