All I have is about $0.02's worth.![]()
The general purpose of a refugium is to provide sanctuary for things that would not live in the display. It seems that the proposed setup covers this aspect.
The general purpose of a sump is room/volume/space to fill with the system water should pumps fail or be turned off. I think there be an issue with the proposal on this point.
The refugium inside the sump arrangement has the refugium taking up the volume needed by the sump to contain the system water. Although your setup may work, you had better make sure that:
1) The refugium volume is not needed by the sump container; and
2) The sump container will still be about 20+% unfilled when all the water from the system drains into it.
A possible downside to the proposed arrangement is that when the display pump goes out, the refugium no longer has circulation in it (it is sunken inside the now stagnant sump water). In my system, when the system pump goes out or turned off, the sumps takes up the water of the system but the pump that pushes water into my refugium will still circulate water through the refugium. This may not be a concern to you, however. ;;
Can't help you on the other flow/pipe questions. I know there is a formula to determine what diameter of pipe is needed for certain flow, but I'm not into that aspect.![]()



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