plants developed white fly

[Cannibis]

Wilting Medical Cannibis.....

I'm a legal, card carrying, medical user, trying to grow in my closet. I have 8 plants in two tubs using the gurgle method under MH. In the beginning, when I purchased the plants from our local Cannibis Club, I was told that if the plants developed white fly to simply take a hand held vacuum cleaner and suck them off. Well, they have appeared and have so far only attacked a couple of my plants but seem to be spreading. These plants they have infected wilt during the day and seem to recover during the night but eventually succumb. Is it the white fly that is doing this? How do I handle this? Should I simply break down the sys and clean and restart or is there another way to handle this? At $20 for each plant I buy from the club and all the money I have invested in nutrients and lighting, I can't afford to loose many more plants. Suggestions?