StagnantReaction, I flush them with enzymes every other week, so that shouldn't be a problem. I've also tied some of the branches down, they're already catching more light as before (I don't know what more I could tie down).
Bfisher, why should I have topped them? It doesn't really matter, if I had, they still had that cold period in between, which stunted growth considerably, if I had topped them I imagine they'd be a lot smaller.. The reason for the yellowing of the leaves..? They're getting enough nutrients, not too much not too little, they're getting plenty of water every 2 days, lamp is hanging at 35-40 cm's from the plants (without heat build-up), I've tested the PH and that's alright as well, I'm not doing anything differently compared to the last grow, except for the cold period in between, which I assume is the reason.. The temps dropped to 11 degrees celcius at night and 15 during the day for 2 days or something, during that time I imagine that the plants had lot's of stress and couldn't transport much nutrients to the leaves..
But it's always guessing. Bud development is going very well now btw, seedlings are growing with the day as well..