I have been poking around here for a few weeks now and thought I would formally say hello to everyone.
I am new to growing, but I have a kickass partner who is guiding me throughout the process of cultivating cannabis using a hydroponic setup.
I will have some questions here and there...
How old are the seedlings? If they are less than a week old (even out to 10 days), you really don't need to use nutrients. They will thrive on water alone.
Since you said the older leaves are showing yellowing, I am guessing these seedlings are at least a couple weeks old. I have been running...