Best Way I Should Show Sex

well i would like to get rid of my males now i got a couple of options what do you all think well i got 2 rooms flours and hps

1) clone them..

2) flower then bring them back to grow cycle

3) i have no other idea let them go till they its time for flower then get them out what would bet the best?

Cut some clones, flower 1 clone from each plant, the ones that come out male kill...the rest veg till the root system is on then flower....simple

how big do they need to be before i clone there about 5 inches tall or so

You got awhile till u can clone unless your using stelroids lol if there 5 inches tall how old are they not counting germination