Make sure the sump will hold the volume of water drained when the return pump is turned off. And vice versa, that the tank will hold the water volume from the return section of the sump in the event of a plugged drain. Drilling a 1/4" hole in the return line(s) just below the water level in the DT will ensure a siphon break. Plumb-in gate valves on drain lines and return lines for easy tweaking of flows.
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225g reef
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