If you add some macro algae and create an area for pods to reproduce then you basically have a refugium. A sump can be as simple as a container of water that the overflow from the tank is connected to and a return pump that pumps water back into the tank.
A popular design is to have something like an acrylic sump or glass aquarium that is sectioned off with baffles where the refugium can be contained within a compartment within the sump.
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