Looks like cal/mag deficiency issue to me and since you said you were using ro water I am pretty sure it is. I had the same issue at beginning of my grow(was using distilled water). I purchased some calimagic and that cleared it right up, I have since been using it throughout my grow. Your affected leaves will not get any better, just look for healthy new growth. Alot of growers use Epsom salts to fix the issue, I haven't tried it so maybe someone who has can help with that.
I like your setup, I'm doing a hydro grow too in an aerogarden and loving it. +karma
I like your setup, I'm doing a hydro grow too in an aerogarden and loving it. +karma
