i know this sounds silly but have you been geting water on the leave's when watering i'am new to this as well so its just a simple sugestion i read nut rich water burns badly if on the leave's and it looked much like your's allso you may hav a diff prob with the others rather than the same thing allways some thing to concider, nice looking plants by the way

more pics would help bro

If you are still out there. get a npk test kit so you know if any of those numbers are crappy. MG soil is NASTY it is for lazy housewives who want to plant pretty flowers by their pool for their party and then throw away the plant a month later when the new home magazines come out with the next new big design fad. Go to a local nursery and buy some good soil (if they ask for what say tomatoes they require the same stuff), you dont neeeeed fox farms stuff, although if you can get it do so. If it is a drive to find some good shit, then buy an ass load of it and sit on it for a while, or start a garden. Good soil is paramount for good grows. I wont plant lettuce in crappy soil, and I am fairly sure you could grow that shit in sand. ANY WAYS check your npk and ph if any of thems are out of whack that should tell you what you need to change, if they are all 5 by 5 then look to micro nutes, also ozone, and co2 could burn that shit... but it sounds like you moved it away. A way to tell if it is O3(ozone) or CO2 take a DEEP breath around your plants if it burns(mouth nose throat eyes) you have a fucked up atmosphere in that area. Also post this in the plant problems zone. Good luck and take what ever MG soil you have left and plant a garden with it or giver some flowers to your mom or nan... now where is my whiskey?

__________________
It shouldn't be that hard to grow they do call it weed for a reason.