Quote Originally Posted by kallidah
I am using premeasured Micro and grow nutrients that came with my system from manufacture.
Thanks for any help!
Are you using them at the same time? Knowing the brand name, dilution rates and N-P-K values might help.

I'm a soil guy, but brown spots can be from root rot, calcium defeciency, ph swings, heat and sometimes bugs.

Just brown spots...no yellowing?
What do your roots look like? (stringy and white, or brown and slimy?)
What is your bubbler schedule?
Have you ever added H2O2 (hydrogen peroxide) or any other additives to your reservoir?
What does the new growth look like? Old leaves are old news, and old necrosis (brown spots) will never 'heal'.
Is the problem spreading upwards?

If using sample packs of off-brand nutrients, I'd start looking for a replacement regimin asap, and post a couple of pictures of your ladies if possible.
Rusty Trichome Reviewed by Rusty Trichome on . Yellow leaves I have 5 plants that have leaves turning yellow on the ends of the leaves. It started out on one plant and has quickly started on at least one branch or more on all the other plants. It started shortly after i added a 90 watt LED UFO light. plants were started on fluorescents. Not sure if that is the problem. I have sprayed them 1 time with fungicide 3. which handels fungus, mites, and insects. It has been 48 hrs since i sprayed and it is still spreading. Here is my set up. Hydroponics/ Rating: 5