hmm if it is an auto and your 3 weeks in , good luck. I don't mean it in a bs way just that there is no time to correct it all the way. Just my experience. Chasing a Ghost. it took me 2 years to get a descent auto. Practice makes perfect so if you want a learning experience chase it and see how she goes. Being your in hydro you can try to correct faster. I would give us some more info like pictures of roots(hydro not soil lol)  relative humidity , Your plant needs to release moisture to take up moisture. Water on the leaves does not help(only for rooting) remember less stress on the auto the better(they are a ball of nerves) Picture of the whole plant as well brother. I am not that experienced in deficiencies others are the bomb on this but i am pretty good at keeping a well balanced environment for them.