I knew they would turn around for you. The new growth looks good. Personally I think you should stick with DWC... You have the proper tools and you can always get decent help on these forums if you run into trouble. Good luck with your grow!
depends on your lighting and ware your garden is. basement, closet, bedroom, hps, led, cfl, cmh, is there central air or no ac, ect. need more details. I talk to my new customers abought this every day lol.
hard to tell when there that small especially in coco. in soil they get all they need from it for the first 3 weeks or so. coco has nothing and even leaches calcium. it only gets what you give and just starting out its easy to over or under feed. as small as they are deficiency looks just like over feed or light stress. sooooo without more information ill give an educated guess. the easiest thing to check and fix is ph. the first pic with the drooping crisp bottom leaves but health new growth I have had seedlings that looked like that in the past I'm sure it was from to much light. on the second pic the leaves are starting to curl up at the edges thats sign of overwatering. that shouldn't be the case in coco. are you being sure to water to 20% runoff every day?
I would leave them. the plant will shed them when its done with them
No a 1000 is not too big for a 4x4, I use one in a 40 inch x 40 inch tent and rock the shit out of the plants in doing so , I do need a 5k but ac to keep it all cool but it runs just fine , keep about 20 inches between the hood and the plants and no problems .
It's not coco my mix is peatmoss vermiculite compost
