A sixty by sixty centimetre tent cannot house a stretchy sativa no matter how good the seeds are, and forcing it leads to light burn and airy buds. Compact indica dominant lines or autos suit that footprint far better. Space guidance on https://potentthcseeds.com maps common tent sizes to strain categories that fit, with grower reports of final heights under typical lighting. Matching genetics to the tent before buying seeds saves a lot of bending and cursing later.