toping them would do good, toping usually starts very early on, to those trying to make a bush type of plant. but if you top now you could get better results, then if not topped. by topping your getting more cola and bud sites, so i say always top especially if you have the room. just remember to stop toping about a week or 2 before 12/12. here is a vid on toping, from a skilled grower.

YouTube - KoMA TOPS EM AGAIN!
MadSativa Reviewed by MadSativa on . patient grow 2nd time around So last time I grew was appx. 10 yrs ago, hah. This time I have an awesome setup, pics comin' soon. My plant is in soil, 2.5 or 3 gallon bucket with good drainage. 7' tall storebought growroom type thing, hps with reflector hood, fans, all the goodies. Plant appx. 8'' tall, 6 or 7 internodes, no visible alternating yet. Plant appx. 5 or 6 weeks old, and I am now using fert for vegging with a npk of 12-6-6. Not much else to say, oh.. strain unknown. So ill post pics soon. Rating: 5