Durban Poison

I don't check the PH but where I live water is low in minerals and low in PH . Honestly I think the pH is important for certain microbes to flourish and feed the plants. The temperature at night is colder than I would like but that will help bring out color at end of flowering . There are trichromes already forming on the tops of the leaves ! This will be a frosty girl. I should have stated that the plant had 18 hours of light for 5 weeks . I don't see any stretch . But looking at other Durban grows it may stretch at week 8 of flowering. The two liter pot will restrict growth. I'm growing four plants in an area 16 by 20 inches. So I keep my plants healthy and compact.