as the others,12c is far too low and will have caused her to cease all activity,join that with purified water,which has nothing in it at all i guess,lacking anything to trigger the uptake of certain nutes.
i hate to think what the temps are at lights off?
also a 60l pot is a tad optimistic,normally a 12ltr will suffice and the wet/dry cycle is easy to suss,60l will hold a lot of water for possibly too long leading to suffocation n even possibly root rot.
a 11ltr airpot works very well
theres been quite a few autos turning up that arent autoing as well ,so could be any or all of these things.
if you cant raise the temps where she growing then tbh id bin her as shell never kick in at 12-15c i dont think,and i take it that measured at canopy height?...in which case soil temps will be even lower
get the enviroment sorted first,no point otherwise.
best of luck chap.
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