aurora indica help and info needed please

ok so i got an aurora and sugar black rose growing was going to veg for 8weeks and then flower them both
i was just wondering if they respond well to lst or being topped ive gota max head height in tent of around 1.3m thats allowing half a metre for my cooltubed 600w hps

fine to let grow or lst i not bothered if they are not lst'd or not justwant to get the most from my plants