looks like you may have a nutrient deficiency there, ur plant looks nice other than that. Questions first, what is ur room temp, humidity, and Ph of soil? What forms of fertilizations are you using? How far away are your lights from your plants? What is the type and wattage of bulb you are using? Lots of questions but I will try to help if I can.
hi sarah ..well i am useing foxfarm soil evantho growing hydro..amd got 2x90w cfl +led panel and not to close either..room temp fine and ph fine too,,i have got more hydro nutes in mail atm any help would be great and u probly rite if using wrong nutes lol ..thanks loads