That sure sounds like fert burn. I'm not familiar with EC numbers. Just ppm. Doesn't matter though, I guess. In my experience, browning of the tips usually indicates fert burn. Best of luck to you.
polishpollack Reviewed by polishpollack on . Crispy tips, yellow n brown spots on fan leaves First of all I'd like to send a general message out to those with plant problems: it helps absolutely no one when the title of your thread says something along the lines of: "help I've got issues!!! Please!!" A title like this is so vague and obvious that it helps nobody. Not the people looking for solutions to similar problems, not to those willing to help you, and ultimately not you either looking for a solution to your PARTICULAR problem. Moving on... I'm doing this on my phone so Rating: 5