I tried Amnesia Gold from them and it was trash, one didnt germ and one stunted pulled it. You get what you pay for Pyramid seeds. none of the reviews were of grown/harvested plants.
Anywho...
from seedfinder.eu
Indoor: 7 weeks
Outdoor: 60 days
Height: 40 - 100 cm
Northern Lights y Black Domina to me is 100% indica so it should have been quicker.
Your plants look very dark Green for this point of flowering like it hasn't finished all the N or since you said DWC maybe too much N in the Rez, cut back a bit only since Indicas seem to tolerate more N.
Cold temps will stunt a plant.
Indicas grow in many hot dry areas near 36N in Afghanistan like mazar i shariff, and not all of them are wide leaf. So much BS pseudo history and science in weed forums i am UN-learning over the years LOL.
Rudelralis will add cold toleration but many Rudies grow in warm areas too i think in nature so it depends.
Pyramid seeds is in Spain I'm guessing their breeders too so doubt they breed for cold tolerance.
What's rez temp at night? 45f is very low.
If i looked at this auto and had no clue about the rest i would say too much nitrogen, and something stunted it to the point it may look like it will just make some small leafy buds but i cant tell if you have low amount and still clear thricomes, then there's some hope.
My strategy now is to presetup everything correctly then germinate, if after 4 weeks it looks like shit i pull it, if it don't flower Indoors after 4-6weeks it's trash. If it flowers 4 month and it takes 2 weeks to barely grow, trash it.
Cheap auto seeds are not reliable, I now stick to heavily reviewed local strains from Dinafem, wickedpissah, nightowl, fast buds, and of course Mephisto who are too expensive IMO and always sold out.
If you have any seeds left im sure with correct environment and Ph etc you will do much better next time.