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Pond Foam at Waterfall: DOC and Food Foam Myth

Pond bubbles at waterfall cover surface; disappear when feeding. Asks how to stop.

Foam = DOC

Aeration fractionates dissolved organic compounds. Sources: fish slime, spawn, excess food, waste, rotting plants. Food does NOT eliminate foam—coincidence.

Checklist

Pond size? Overcrowded?
Water changes done?
Water tested?
Fish food brand? (oily foods increase DOC)

Remedies

Water changes, activated carbon, reduce feeding. See DOC article.

Pond and Water Gardening: Koi Flashing and Ulcer: Parasite Treatment Protocol; Overwintering Pond Goldfish: When to Bring Them Inside; Pond Volume & Pump Size Calculator; Pond Size Check: 9×4 ft, Variable Depth, 13 Fish; Recurring Red Rash on Koi in Overstocked Tank: Parasites, Bacteria, or Stress?; Soap Bubbles in the Fish Pond: Why You Must Drain and Restart; Moving Feeder Goldfish Indoors for Winter: Tropical Tank Risks; Pond Bubbles and Foam: DOC, Soap, or Gas?; Bubbles and Green Water in a New Koi Pond: Patience and Peat; Pine Tree Foaming in Rain: Natural Soap from Bark Salts

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