Folks I have a question. I have 3 grow beds that are higher then the fish tank for gravity feed but I cannot run the drain pipe straight downhill all the way to the tank I need to run it down to ground level and over to the tank and then back up and into the tank. You can see my build on my other thread here: I am building a system - Update 5/5/13

Has anyone done this? Theoretically it should work since the height at the other end of the drain will still be lower then the grow beds but I was just wondering if it might cause to much back pressure so it won't siphon? The water will need to go back up maybe 20"-24" to get back in the tank. I will run down hill as far as i can before going to ground level but it may be about 3 feet at ground level before it needs to go back up to get in the tank. Thanks ahead of time for any feedback.