I have two 1.5" drains on my aquarium and two 3/4" returns. As I'm in the process of redoing my filtration I have decided to use the herbie method for my overflow. I have a question. Does the ball valve have to be on the vertical part of the one drain? The reason I ask, is that I would rather put the valve after a 90 degree elbow so its easier for me to adjust instead of reaching behind the aquarium. Let me know if you have tried this or if that will work.
Thanks
Thanks