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The Short Answer: Roughly 1 Inch of Fish per 10 Gallons — But That's Just the Starting Point The old "1 inch of fish per 10 gallons" rule gives you a floor, not a ceiling. A healthy koi pond can...

Size pond aeration by surface acres, depth, shape, diffuser placement, tubing runs, fish load, power access, and pond audit details.

Size a pond pump by gallons, waterfall width, head height, plumbing, filtration, fish load, and when to ask for pond audit help.

Find the likely causes of green koi pond water, then compare UV, filtration, pump flow, fish load, and pond audit next steps.

Compare EasyPro SMF skid mount systems, PBF bead filters, Eco-Clear filters, pump flow, UV, fish load, and sizing checkpoints before choosing pond filtration.