How to help a new betta adjust to an aquarium without causing sudden temperature or water changes.
Acclimate a betta slowly by matching temperature first, keeping lights low, and avoiding sudden changes. Never pour unknown store water into the tank if you can avoid it.
The tank should be heated, conditioned, and ready before the fish arrives. Acclimation cannot fix an unstable aquarium.
Float the sealed cup or bag long enough for the water temperature to move closer to the aquarium temperature.
Use a small container or net to move the fish while limiting store water entering the tank. Keep the room calm and avoid feeding immediately if the fish is stressed.
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