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TL;DR: A protein skimmer removes dissolved organic compounds before they break down into ammonia — it's the most effective piece of filtration equipment for saltwater tanks beyond a sump. Size it for 1.5–2× your tank volume, match the type
TL;DR: Freshwater tanks cost less, tolerate beginner mistakes, and cycle faster. Saltwater tanks offer unmatched color and biodiversity but demand tighter water chemistry, specialized gear, and a bigger budget. Pick freshwater if you're und
