I don't know about the smell but your plant is clearly unhappy with current soil and or nutrients. Leaves are showing an overwatered look which could also be poor aeration. Nutes are either deficient or being locked out. You could check your soil ph, source water ph, and runoff ppm to get a better idea. I'd suggest scrapping this dirt after this run, which may not produce much at this point, and mixing up something completely new for your next run. Lots of good recipes around.