Plant health

My watermelon is a week ahead of yours. I would cut back to a half gallon of water a day. And only about 800 ppm nutes. I can’t speak for the other strains. As others seem to like different amounts. Don’t have a full diary. But I have an 8 week pic of u wanna take a glance. Happy growing!! If u have a questions ask. Also I’ve noticed with autos. The seem to respond well to defoliation every 2 days. Taking fan leaves off that are 5 inches or larger.

They look droopy like over watered. Auto flowering plants are not my jam. They are fussy fuckers and i've got no interest in fucking with them, and have very little experience growing them. They seem like they are more trouble than they are worth.

Few things I would like to suggest. lighting. 18/6 is plenty and anything over it tends to be wasteful, plants need rest and its best to give them a solid 6 hours min. RH is a bit high, in flower its best to try and aim for 45-55%, helps avoid bud rot, not 100% but it helps. No EC values? with autos they like to feed on the lesser side of things, I don't see any PPM/EC readings, might be good to monitor that if you have any issues with the setup. Over feeding them will cause them to go into early flower and can impact yields. You also have a lot of mold growing on the surface of the medium in your diary pics. spray it with 5% white vinegar undiluted, or 3% hydrogen peroxide. just to the first 1mm of the medium, this will help keep it in check and not spread to the buds as this is the same mold that causes bud rot. Everything else is looking pretty good. Good Luck!

Yes I know what this problem is. Stop giving the Bio Vega nutrient! This does contain too much nitrogen for this phase of the grow!