DIY Aquarium Rack for Fish Room: Plumbing
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One drain line runs horizontally for each of the two shelves. The 2-inch pipe drains from left-to-right and connects to a 90-degree run down to the sump.
The sump is a standard 75-gallon glass aquarium.
The return pump is a MAG-12. The return line is 3/4-inch PVC. The flow for each tank is controlled or restricted with a ball-valve.