Kas, that plant has alot of sativa in it. Hazes tend to get leaf curl due to over ferting. Im not saying it is a haze but it is def mostly sativa. I would say your best bet is to flush the soil and just use plain water. If you are not running 12/12 right now, you should start soon, because the stretch will get out of hand on you. Hope things go well. Dont worry about repotting them, more roots mean more bud.