The reef company that building my new tank, suggested I go with 4 returns drilled up from the bottom of the tank. This would give me lots of flow. The tank will have one overflow box internal in the center of the tank, which will be for herbie type overflow.
I don't have room behind the tank to really bring the returns over the top nor do I want to.
My question is what happens when the power goes out to those 4 returns, won't they flood my sump or will they need to have some type of major PVC check valve?
Thanks
I don't have room behind the tank to really bring the returns over the top nor do I want to.
My question is what happens when the power goes out to those 4 returns, won't they flood my sump or will they need to have some type of major PVC check valve?
Thanks