I never recommend aerating leachate since feeding it could grow the bad bacteria instead of the good. You could just take some of the finished compost or worm castings if you have worms in your tower, I know I have talk to some people that have added worms to the tower. Use that to make your aerated teas with. There is a lot of information out there you can find using the proper names. What you have is leachate if you want to research information on it and what you are wanting to make is aerated worm teas so if you use those terms you will get a lot of info out there to help with what you are looking for. I always try and use the word leachate and when I talk tea it is aerated worm teas. It can get very confusing when people use terms like worm wee, worm tea etc and that is how the companies take advantage of marketing. That link has a lot of good information on it and there are also several good groups on Facebook if you use that platform that can share information with you. My facebook page is linked on my profile if you want to message me there since it is setup a little better for sharing information quickly and linking information.