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Update
I hope you are having a safe, healthy and happy holiday and that at your convenience, you'll have time to respond.
This is in reference to a 200 gallon reef tank with a remote sump in the basement and using an additional closed loop.
Rather than using a wavemaker on the pumps, the better course seems to be to use actuated (or motorized) ball valves.
My current thinking is to locate both pumps in the basement. One circulation loop will pull water through the sump using an Iwaki RLT 100. The other circulation loop will be a closed loop powered by an Iwaki RLT 70 or 55. Both loops will have actuated (or motorized ball valves).
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