wilting prob with pics,

i am growing quebec gold the wilting ones and the others are freezeland they are in the same room, earth, pots, conditions, but are different strains of course. almost all my quebec golds are wilting not cause of lack of water, my freeze are all fine, i also have 2 QG that are fine,,

my day temps are around 80 degrees and night temps between 50 and 60 degrees, still havent added a heater,,

any ideas, its not a salt lock up, i used RO water and i have done 2 waterings with no ferts to be sure, no change yet. they are 8 days into flowering, i need help cause the QG seem to have smaller buds than my m39 and freezeland, even a huge mother freezeland that is also wilted is still growing at a great rate but these QG seem slow.. help please

how often are you watering it, it looks like it could definitely be over watering, also you may want to switch to a bigger pot, i can't really judge the size from that pic
but that plant is going to want to stretch and if you want more plant above, you may need more room for roots below at least assuming there is soil under that hydroton.

good luck other than the wilting everything looks awesome

it looks like underwatering to me. overwaterring usually i would say is more of a bent leave then a total weep like that. i could be wrong though