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I have a new tank. larger 72" tank with a center overflow. The top is what you expect with center overflows, but I noticed this bulkhead at the very bottom as you can see from the photo. What is it? It can't be a drain, since it would drain the entire tank down to about an inch above sand.. Can't be return because thats already comes out on top. Manufacture not responding so can't figure it out.
I'm hoping it's some kind of drain to help take in water towards the bottom of the tank so it doesn't only take from the surface level overflows. Any one have this on their tanks? Exist on both sides of the center overflow column.
I'm hoping it's some kind of drain to help take in water towards the bottom of the tank so it doesn't only take from the surface level overflows. Any one have this on their tanks? Exist on both sides of the center overflow column.