06/09/2026
Acclimating new fish safely requires gradually matching the water temperature and chemistry to prevent lethal shock.
Temperature Equalization (Float Method)
Turn off or dim your aquarium lights to lower stress.
Float the sealed transport bag directly in your tank for 15 to 20 minutes.
Roll down the top edges of the bag to create a floating ring if you open it.
Water Chemistry Adjustment
For local store purchases: Add about half a cup of aquarium water into the bag every 5 minutes over a 30-to-60 minute span.
For delicate or sensitive species: Use the Drip Acclimation Method by placing the fish in a clean bucket and using airline tubing to siphon tank water at roughly one drop per second.
Avoid long drip times for fish ordered online, as sealed shipping bags build up toxic ammonia that spikes rapidly once exposed to oxygen.
Transferring the Fish
Scoop the fish out gently with a small net and place them into the display tank.
Discard the bag water down a drain; never pour it into your aquarium, as it contains accumulated waste, parasites, or harmful medications.
Keep your tank lights off for at least 2 to 4 hours (or overnight) and avoid feeding to let the new additions settle peacefully.
Watch a helpful step-by-step demonstration on how to properly float and add aquarium water to safely acclimate your new fish:
If you'd like, tell me:
Are these freshwater or saltwater fish?
Did you get them locally or shipped online?
I can give you a more specific acclimation timeline for your exact species.
