How are your roots looking/feeling? My first dwc attempt my plants looked very small and unhappy and it ended up being a root infection. You can brew some hydro tea to populate beneficial bacteria to fight root zone pathogens. On that run 3 years ago I ended up pulling my plants out of the dwc, hit the roots with physan20 dunks and transplanted into coco coir. They were stunted but was able to get them to finish. Not saying you have to transplant, but it is an option if it doesnt seem to recover. I would try the hydro tea first if you can. You will need some beneficials like great white or similar (not sure if great white is the best but it's what I have) backstrap molasses, earthworm castings, nylon sock (cheap pantyhose works great) strong airpump, a bucket, airstone(s). Make sure to use RO water or water that has been dechlorinated. I do 4 gal ro water, 6 tbsp of molasses, 2 scoops of great white, 1.5 to 2 cups of the EWC in the nylon sock and brew for 36 to 48 hours. I suspend the sock directly above my airstones. You should end up with a mushroomy slightly sweet smelling product. If it smells like decay or moist soil, it's gone bad. I add it at 20:1 ratio 20 parts nute solution 1 part tea. You must use it within 24 hours of brewing or you can store it for a few more days in the fridge. I use it on all of my plants in coco coir, dutch buckets, kratky tubs, and soil. Hydro can be a testy B but once you figure it out, the speed and yields are worth it.
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