hey, try flushing out your hydro setup with just water for about a half an hour. itll get any toxic salt buildups out of there. i think thats why your leaves are curled under and a dark green. this will also make your bud better once you fix the problem. i have had the same exact problem with my hydro. i never flushed it, so i think it was toxic salt build up. i looked it up in my growing book.
