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Tools You Need
Fish Net
Used to transfer the fish safely without introducing shipping water into the aquarium.
Clean Container or Bucket
Required for drip acclimation when a slower adjustment is needed.
Airline Tubing
Allows controlled dripping of aquarium water into the container.
Towel and Clear Workspace
Keeps the process organized and prevents rushed handling during transfer.
Why Acclimation Matters
A sudden change in temperature or salinity can overwhelm the fish’s system. Proper acclimation gives the fish time to adjust gradually, reducing shock and improving survival.
Standard Acclimation Method
Bright lighting can stress a fish that just spent hours inside a dark shipping box. Keeping lights off helps create a calmer environment and reduces sudden movement in the tank.
Place the sealed shipping bag directly in the aquarium and let it float for about fifteen to twenty minutes. This allows the temperature inside the bag to slowly match the aquarium water.
Look for steady breathing, calm movement, and normal posture. If the fish appears erratic or stressed, consider switching to a slower acclimation method.
Use a net to move the fish into the aquarium. Avoid pouring shipping water into the tank, as it often contains waste and poor water quality.
Drip Acclimation Method
Used when fish are stressed or when water parameters differ significantly.
Step 1:
Prepare the Container
Place the fish and shipping water into a clean container near the aquarium.
Step 2:
Start a Controlled Drip
Use airline tubing to drip aquarium water slowly into the container over thirty to forty minutes.
Step 3:
Complete the Transfer
Once the volume has doubled, net the fish and place it into the aquarium without adding the original water.
Video Instructions How the Team of CoralsDepot Does it
What Fish Need After Acclimation
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Dim Lighting
Keep lights low during the first hours to reduce stress and help the fish settle.
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Stable Water Conditions
Avoid adjusting temperature, salinity, or filtration during this period.
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Minimal Disturbance
Limit movement around the tank while the fish adjusts to its new environment.
What to Expect in the First 48 Hours After Acclimation
First Hours
Fish may hide or remain still while adjusting to the new environment.
First Day
Most fish begin exploring slowly, though feeding response may still be limited.
After 48 Hours
Behavior becomes more stable, and the fish typically resumes normal movement and feeding patterns.
Common Acclimation Mistakes
- Pouring shipping water directly into the aquarium
- Skipping temperature acclimation
- Turning on bright lights during introduction
- Handling the fish with bare hands instead of a net
Avoiding these mistakes keeps the transition calm and controlled. A new fish already experienced hours of shipping stress, so the goal is stability. Slow handling, dim lighting, and clean transfer practices give the fish a better chance to recover and begin settling into the tank.
If Something Looks Wrong
Fish is breathing rapidly
Check temperature and oxygen levels immediately.
Fish is not moving
Allow more time. Many fish remain still during early adjustment.
Fish is swimming erratically
This may indicate stress from sudden parameter changes. Keep conditions stable and avoid further adjustments.
