i think what you are asking is how to get the tubing inside the tank because the position of the tank don't matter a mister is a mister, you just have to figure out how you are going to attach it inside the tank. If you can't go through the top of the tank sounds like you are going to have to maybe make a hole in your screen as close to the top of the tank as possible and put the hose through there your only other option really is to drill a hole in the glass on the top to put it through that and with drilling glass come risks of cracking / breaking it