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The only thing that stands out to me now as well as before is the 40g main sump. I think it is too small.
Try to determine the surface area of every vessel, assuming each one will drain only 1" worth of water. Will the main sump hold all that water in the event of a power outage? If it will, then you're set.
If it was me, I would make the main sump huge. Just eliminate the water change vessel. Turn off the external pumps and let all the water collect in that main sump. Pump it out and replace it with new ly aged saltwater. It shouldn't take more than 20 minutes, then restart the pumps.
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Marc Levenson - member of DFWMAS
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