Refugium are really simple. They are essentially an area for critters to take "refuge" from the predator fishes in our tanks. They are a great place to grow macro algae, and house excess rock or whatever.
Mine is just a compartment in my sump, which is just made by sectioning off a portion using glass baffles. You are welcome to come check out how I have done mine. If you have a mantis shrimp in your display, a perfect home could be your refugium. Mantis are super cool, hopefully you got a colourful one.
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