I recommend a protein skimmer for overall aquarium health since it is a more effective tank cleaning system than a HOB filter or refugium. If possible, I would run both a protein skimmer and grow macroalgae in either a HOB refugium or in a sump. That and small (5%) water changes every 2 weeks is what always worked for me.
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Mantis shrimp are the best!
Current Tank Info: 20L Peacock mantis shrimp tank
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