Goldfish Dying Daily After Stocking 50 in 2000-Gal Pond: Overcrowding and Feeder Fish Risks

You Added Too Many, Too Fast

50 goldfish in ~2000 gal = 40 gal/fish. Acceptable *for mature, healthy fish*. But **feeder/comet goldfish from stores are often diseased** (parasites, bacteria, viruses). They should be quarantined 4 weeks with treatment.

Likely Causes of Daily Deaths

• Ammonia/nitrite spike from sudden bioload increase.
• Pre-existing disease (ich, flukes, columnaris) spreading in stressed fish.
• No quarantine = introduced pathogens.

Emergency Response

1. Test ammonia/nitrite NOW. If >0, do 25% water changes daily.
2. Add salt 0.1% (20 lbs for 2000 gal) — reduces nitrite toxicity, supports slime coat.
3. Add MelaFix (antiseptic) per label. Aerate heavily.
4. Remove dead fish immediately.
5. Do NOT add more fish. Wait 30 days with zero deaths.
6. Future: Quarantine all new fish 4 weeks with salt + praziquantel (flukes) + antibiotic if needed.

Stocking Reality

Your pond can support ~30–40 *healthy* goldfish long-term. 50 is pushing it. Thin the herd if deaths continue.

Feeder fish are a gamble. Pay more for healthy, quarantined stock from a reputable dealer.