I just put some of my babies into 12/12 flowering. I am going to use your idea for prevention, because it looks like I am aphid free for now. I have used H202 before and it seems to be very plant friendly. The soap insecticides dried out and withered my leaves in my recent experience. I have a full bottle of the potent percentage H202 on hand. Thanks for bringing up the idea. I used H202 before for powdery mildew.