For a few months I seemed to have success with the way I had my piping in my overflow (pictured below) All of a sudden one day I wake up to my tank being overflowed because the return pipe was no longer taking in water. I assumed that something had gotten into it and clogged it, so I pulled everything apart and took a look. To much surprise there was nothing in there at all! I put everything back together and still had the same issues. I popped the top off to just leave a straight piece of PVC there and the water is now draining fine. I have no clue why my setup worked for months and then 1 day stopped working. What is the best way to run the piping?


