ya leaf curl is one that can be a few things..
I got a plant right now that doesn't like anything but tap water.. if I add ANY nutes at all.. it gets super dark green.. and curls like a motherfucker.. and the yields suffer a lot.. WIERD RIGHT?
does amazing outdoors tho. just set it and forget it lol.. no nutes .. and u get a nice green dark plant all the way to the end of flower .
Crazy weeds.. mine appears fairly light green.. where my old outdoor were always dark green..