yeah that could be the cause. You changed the environment. It looks something its pulling from the K-Mg-Ca chain (mulders chart study is mandatory m8!). Roots acclimation imoThe guy I got these clones from a dude I'm sure did 24/0 but I kept them inside under 18/6 for about a month, then put them outside permanently on may 16 after about 3 weeks of daily hardening off.