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Float the bag to equalize temperature (15-20 min), test your quarantine tank water, acclimate slowly by adding tank water to the bag over 30 minutes, then net the fish into the tank. Never pour shipping water into your tank.
Yes, always quarantine new fish in a separate system for at least 14 days. This protects your existing fish from potential diseases and parasites that new arrivals may carry.
At minimum: appropriately sized tank, cycled filter or plan for daily water changes, air stone or circulation pump, heater (if needed), cover or net to prevent jumping, and a water test kit.
Wait 24 hours before the first feeding if fish are stressed from shipping. When you do feed, offer small amounts of easily digestible food. Watch to confirm they are eating before offering full meals.
Healthy koi are active, have erect fins, clear eyes, no visible lesions or discoloration, and eat readily within 1-2 days. Any persistent abnormal behavior within the first week warrants closer monitoring.