Howdy smeg,
Bro, it's all fixable.
Problem is your autopot. Can't grow in those like u do with top feed hydro or soil--and they can be hell, theoretically, for autos. Problem is autos are age sensitive not photosensitive and in autopots u gotta waste time top watering to establish some roots then let the medium dry out for a week to get them to put down root mass and this seems to be when auto flowers wanna boogie but you're stuck farting around with this, essentially, wick system. Common mistakes: hooking valves up too early--leads to conditions too wet low in the pot before roots are big enough to drink quickly; so you're getting salt buildup, not enough aeration, and the pH begins to go nuts! Gotta go real mild on notes bro till mass of plant is almost big as the pot, if u ain't familiar with stress signs on these capiliary systems.
U got hen poo in your coco so give pots a good flush with tap water to dilute it all. U gotta get pH sorted. If pens are giving u the shits get a liquid aquarium pH test kit and dose pH corrected nuts no stronger than 300ppm and pH of 5.5 - 5.8. Water with this every two days --but only a little, not enough to run out the bottom of pot. The aggregate pH will sort itself out over time. Looking at your plants, water liberally with plain pH'd water every six or seven feeds. When the plants have gotten almost big as the pot hook up the valves to pH corrected nuts no stronger than half strength u would use in recirculating systems and run plain water in res every three res fulls. Oh, and dude, lift the lights. Little suckers ain't big enough to need much and u don't wanna stress them
Good luck bro!