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I still use a HOB filter. If you happen to treat with a medication, most are gentle enough to not hurt the biological filtration. Tank, heater, something for flow, ammonia alert badge, shouldn't need nitrite or nitrate test kits. A skimmer would be useless if you are to treat because it would need to go offline. I feel a light is a must so you can visually inspect the fish multiple times throughout the day. Live Rock is fine for certain fish to help them adjust but definitely not needed.
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