Protein skimmer
Foam-based mechanical filter that removes organic compounds before they break down.
Air bubbles in a tall chamber attract organic surfactants. Foam collects in a cup at the top. Sized at 2× display volume minimum. Critical equipment in saltwater; not used in freshwater (no surfactant chemistry).
Recommended
Affiliate linksMost-recommended skimmers in the hobby.
Bubble Magus Curve 5 skimmerBest budget skimmer. Rated 55 gal heavy / 90 medium / 120 light bioload.View on Amazon →Reef Octopus Classic 110-INT skimmerMid-range workhorse. In-sump, 60 gal heavy / 130 gal light bioload.View on Amazon →
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