FIRST GROW 2 Auto Gelato & 1 Auto Lemon

Them leafs at the end brother are from your last mistakes, they won't change with all the magic in the bud world. Increase ur cal mag. And other grow question was right too pots that big you should have a root stim and a micro, kinda defeats the purpose of growing in big pots if you aren't gonna stim youe roots. Yeah, increase cal mag. Get some basic npk grow and micro and you'll be laughing Amazon do a good trio for 18$ of general hydroponics or Advanced Nutrients are cheap. If you g9 with AN. Get vood0o+tarantula+ piranha this will deal with micro enzymes root stim and tarantula is both and also helps break down and root rot which you might get growing in soil and over watering. As for it now with what u got. Increasw cal 1.5-2ml/l and get some basic grow+bloom+micro if you already haven't got bloom. And if you wanna go all in for a few extra bucks get the AN gear it's great. Hope this helps.

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The size of the pots is ok, when they grow in the ground as in nature, they have acres of room for root growth. The lighting at 18/6 is perfect. Lights at 30 inches maybe a tad too far away, about 24 inches is better. No fan is no good, they need air movement to be able to transpire properly. All your pictures look like a much too wet substrate, water only once the top 2-3 cm have dried out completely. The damaged leaves will not recover, but your new growth should be fine. Add a fan, reduce the watering, decrease the light height and start feeding more regularly, with half strength and things should pick up. A dose or three with some seaweed tonic/extract would also help them recover. Remember too, you are on a new adventure with growing and to get familiar with what it takes, takes time. Hope this helps, Organoman.