hi khan
just read your thread from the start and ive noticed you have the same set up as me, i really like using nft cos its so easy to use, but ive noticed that on one of my trays in my flower room, where the solution flows onto the tray my roots are starting to turn brown. ive got plenty of oxygen in there as well as liquid oxygen so i no it cant have any thing to do with that. i was just wondering if you have every had this problem with your trays, hope u can help cos i cant think of why my roots are doing this.

peace