this is my second grow using hydroponics.im using a air bubble system with led lights.the system is in a cabinet.i have some leaves turning yellow and dying and i dont know whats causeing it.i mix the fertilizer by whats on the label but have no way to check the ppm.any ideas would help

age, light schedule, pics, would all help.

We need the info OCNORML asks for but if I had to make an off the wall guess,....the first 2 things that would come to mind is needs either calmag+ or nitrogen but it is kind of anal for me to make any guess

Trying to grow hydro without being able to check your tds and ph is like trying to drive with your eyes closed. And seriously, newbs, not even 2 minutes of research will tell you that, before you start clogging up our forum with threads like this.

My vote is that this thread be deleted..

Yeah, I can be a dick. Sorry. Lol. Yellow leaves usually means raise the tds, not enough nitrogen. But without a ppm number, or a pic, none of us are going to really be able to say how much of a % increase in nutes is required, or if there is anything else wrong.