Indoor Flushing dilemma

[Steamer]

Hello all. Again I ask for your help. I have a 4 site hydro setup and all 4 plants are at different stages of growth. My one widow Ryder is flowering and is the most advanced. I also have a photo kushage which I am using as a mother for clones. How can I go about flushing my auto and not disturb the other plants? Also at what point do you being a flush? Thanks, steamer

 

[namvet]

Are your girls in seperate pots or cells? I'm not a hydro man but I know that in soil it's usually about two weeks before harvest when flushing starts.