Drooping leaves!

Athena nutrients oooo arnt we fancy :P I joke I joke Yeah you hit it right on the head Overwatering I use alot of rock wool and its designed to hold onto as much water as possible so it can be common problem to over water my advice get more rockwool larger cubes for them to sit on or try and shake off the excess :) warm the area up to encourage evaporation up the rh abit and yeah you should be fine is this an NFT set up I started growing in NFT what I would do if you dont get more rockwool get some root matting matireal to guide the roots where you want to if your not planting these and not using larger rock wool your going to damage roots with the light unless you cover the rock wool cubes with some kind of sheet or cover which is what i used to do :) Best of luck anyway im sure youll sort it and even if you dont you have plenty more by the looks of things it could also be underwatered so if thats the case add abit and it will bounce back in a few hours :) 👊