What a week full of problems! I have too little knowledge to tell what went wrong but almost everything went south in both water reservoirs from water and tent temperature at night, too low humidity, PH issues, nutrient burns, brownish floating things in the water to a very weak stem that cannot hold the plant up right and needs support.
I've exchanged both water reservoirs, cleaned them with only water and a sponge and added 40-50L into each of fresh water and left the plants on a water only diet for a few days. They seem to get back on track very slowly but I believe they are doing better now.
The Barney's Farm LSD didn't get hit very much by my fuckups and I'm happy that it's pretty fine even though it's way smaller than Hulkberry. Hopefully I'm on the right track with it...