i am looking to pull a clone off each one of my plants for sexing purposes. how long dose this clone need to be to do this? i am planning on cutting the shoots, placing them in distiled water under a dome. i have a 4' florsent that i will set to 12 on 12 off. this will be the first time that i will be attempting this so if there is any other info that will make this process go better please let me know.