Well, to base an educated diagnosis, there is much more information needed eg: pH, feeding cycle, what the N-P-H of your nutrients is, what dilution you are using, how often you flush your reservoir, the sterility of the equipment, etc. The foul smell could be attributed to a number of things like mold & mildew, over abundance of salts in the feeding system, or organic hand-feed fertilizer rotting in the feeding system. If you go through and post the troubleshooter we might be able to get a firmer grasp of what's going on here.

JSG.
JeffersonStateGrower Reviewed by JeffersonStateGrower on . Extreme wilting, foul smell My plant seems to be dying again. What does this look like? First photo was taken the day before the wilt. As soon as the third set of true leafs started to grow, dead, just like any of my previous attempts. I sprayed it with RO water after I noticed the wilt, which is why it will looks shiny. Rating: 5