It can be a separate tank or sectioned off in your sump. You don't need to add anything to it except lights. The water will circulate through your display tank. It helps eliminate nitrates (plants- chaeto other macro) You could also have a sand bed in it, breed pods for fish food. If it's out in the open, you could add snails, shrimp, or small fish (depending on the size of refugium)
Kim
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