Fear not my friend. I have some experience with dwc. Right first things first. Water tempture. IS the bbiggest issue facing DWC growers If the water is too hot the water is not getting any oxygen. Or it cannot uptake the oxygen that it needs. I have around 4 grows under my belt in buckets and it really comes down to your lighting. If you use HID lighting that heats up everything in its path your going to have problems. 12 hours is a long time for something to build heat and if its black it will absorb the heat and transfer it to your water. If you have LED lights this does not effect you as much as HID. the next most important thing in our systems is air the air must be cool and the air going into the pots must be fresh air not co2 rich air from your room I suggest putting the pumps near the intakes for your tents. You need alot of air to grow a large plant that is going to produce alot with training. With enough air the right temperatures of the water the only thing left on the list is nutrients now. This is a very touchy subject when it comes to DWC as there are not many products on the line specifically aimed at DWC there are a few and plant magic springs to mind. What I prefer to do is mix my own nutes for price and predictability I have found it a hard curve to get my head around and im only just starting to see the potential of DWC pots. Plenty og Cal-mag is what you need in my experience. I try and keep nutes low and only increase if i see problems. I've only been cultivating for around 5 years but I've only touched soil in one attempt and the rest have been NFT or DWC. From looking at your plants they are doing really well but I don't think your system is reaching its potential personally I think the browning of leaves and if anyy are curling downwards with no heat stress that would indicate in my experience there is not enough air in the water and you are drowning your ladies. I would say your stalky skinny issue is due to an in balance in your nutes. I have seen friends that have the same problems they seem adamant it is the nutes that cause mutations like this. the bud will still be nice and smokable :) I wouldnt worry too much pal overall looking like a great grow. a tip to keep your water temps down is freezing small 500ml bottles full of water screwing the lids on then placing a couple in the buckets that can help bring the water temps down.
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