im a first timer one of my plants is pretty healthy except for jagged leaf tips. its about a foot away from a 400 hps stays at about 80....20-30 percent humidity,
That all sounds pretty good, humidity should be closer to 50%
but its only affecting this one plant so i dunno whats up with it i thought it could have been magnesium deficient but i watered with some epsom salt and its only gotten worse
Don't do that again. lol I remember reading about these kind of problems. I picked up an axiom.
IF IN DOUBT, FLUSH IT OUT. See, by flushing it, you don't have to diagnose the problem. You just get rid of it and start over. Use 1/4 strenght nute solution, and pour it thru, water it down good, remember the carpet, don't get it wet. If you don't have water running out, you have poor drainage for that one pot? Now let it sit for a couple days to clear the slate and water with regular nute solution. Remember its just a weed, you don't have to get a doctorate.
any advice would be great thanks!
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Try it. VV