I think I understand in theory, like how to physically do it but how it's going to work is what I think is scaring me. I think I'm just going to go for it. I got mine all individually because I was only going to do one waterfarm (yeah right!) than two, than three and so on and so on! So I don't have the controller and res. things. Do you have two, like the 13 gallon and 8 gallon or are you just using one to recirculate. I was thinking about just doing one, I don't know if it's really neccessary to have the extra res just sitting on top. It's just now isn't the most opportune time to experiment ya know what I mean. Thanks alot for trying to help me understand, glad I'm not a pest to you or anyone else that has tried to help!