* Water Parameter Shock: Fish are sensitive to changes in water parameters like temperature, pH, ammonia, nitrates, and nitrites. Even if your tank is established, a 4-hour wait isn't enough time for the new fish to acclimate to the new environment.
* Stress: The transition from bag to tank is stressful for fish. A longer acclimation period allows them to adjust gradually.
* Disease Risk: Introducing fish too quickly increases the risk of spreading diseases to your existing tank inhabitants.
What You Should Do:
1. Float the Bag: When you bring your new fish home, float the bag in your aquarium for at least 30 minutes. This allows the water temperatures to equalize.
2. Drip Acclimation: After 30 minutes, use a small siphon or airline tubing to slowly drip water from your tank into the bag. This gradual exchange of water helps the fish adjust to the new parameters.
3. Observe: Watch for signs of stress like rapid breathing, hiding, or erratic swimming. If you notice any of these, extend the acclimation time.
Generally, a safe acclimation period is at least an hour, with 2-3 hours being ideal for most fish.
Important Note: If you are dealing with delicate or sensitive fish species, consult with a fish expert or your local aquarium store for specific advice on acclimation times.