hard to tell with that pic but if its a WHITE hair its female, post a couple more pics.
stop by my journal in a min comment on my ScROG action im gonna try.
have you PHed ? it would be first step to proper diagnosis, if your PH is fine then you know its not lockout. if the PH is off you can refrence a chart to see wich nutes or micro's are locked out at your current ph level then go from there.
i hate giving diagnosis on here its really impossible to tell from just a pic without propper information.
Okay and forgive the noob-ism but what is the best way to take the pH? I have a solution tester but it is only accurate to .5 pH and by colour only.
Do i take some soil from near the roots and mix it with some water? I've heard that testing the run off is not an effective way to test because the water wasn't in contact with the medium long enough.
or do I need an accurate pH meter?
you just had a similar issue with PH recently no Loyal?
Sure did. They pulled through it though! Get an accurate reading and we can go from there. The sooner the better! If its low, dolomite lime is the way to go ($14 for 50 pound bag). You may have to water it in though, since mixing it in your soil won't be an option at this.point. but we are getting ahead of ourselves. Find out that PH bro!