Small leaves, purple leaf stem and veins. Newer growth drooping

Thanks guys! I may put my tube heater outside the tent where air is being sucked in as it may be getting cold at night. And I'll let her dry out and give her a flush with ph water as I've got a feeling it may be ph again. P defficiency crossed my mind... but lower leaves seem to be fine l. Any thoughts on that anyone ? What would you say is the best ph for early flowering ?

Welke medium kweek je in?Controleer je de ph van je water na toevoeging voeding?Deze is best een 6,5 voor grond.Grond kan misschien te vaak te nat zijn,lamp die te dicht hangt of te koude lucht die aangezogen word in de tent.Er kunnen verschillende oorzaken zijn.Maar hoeven daarom nog geen ramp te zijn voor de verdere kweek van je plant. Ik heb dat ook gehad met mijn planten en heb nu mijn ph aangepast en mijn lamp ook wat verhoogd en de potten vaker eens goed droog laten komen,en de planten zitten nu in week 10 en doen het super denk ik toch.

Lamp to plant distance can certainly cause purple stems and veins, as well as bleaching of leaves closest to the lights, yellowing tips, burnt curling leaves. Having the light 13 inches away is pretty close for early flower. I run a spider farmer sf-1000, and during early flower I have to be about 22 inches away or I start seeing light damage. Other than that, make sure your ph is where it should be, and don't water until the top inch of soil is dry. Happy growing.