WHEN AND HOW TO UPGRADE TO A LARGER TANK
2. Relocate your fish to a quarantine tank, if possible, to avoid putting them under any stress during the process of upgrading your tank.
3. Fill the new tank with as much water from the existing tank as possible and transfer the gravel from your existing tank to the new tank as well. Beneficial bacteria responsible for maintaining the nitrogen cycle in your tank are most heavily concentrated in the substrate but they can also be found in your tank water. By transferring some of your substrate and tank water to the new tank, you can greatly reduce the amount of time it takes your new tank to cycle.
4. Set up your aquarium heater, filter and lighting system in the new tank and plug them in to be sure they work. Let the heater and filter run for a full 24 hours before you continue setting up the tank. This should give your tank temperature time to stabilize.
5. Add your decorations to the tank and fill the tank the rest of the way with fresh tap water. Dose the water with an aquarium conditioner to remove chlorine and other chemicals your water may have been treated with.
6. Let the tank run for another 24 hours then test the water using an aquarium water test kit. When evaluating the results of the test you should pay particular attention to the levels of ammonia, nitrate and nitrite. As your tank cycles, the beneficial bacteria in your tank will convert ammonia into nitrite and then into nitrate.
7. Test your tank water once a day as it cycles. When the test registers a zero level reading for ammonia and nitrate and it begins to pick up a nitrite level it is safe to assume the tank has cycled.
8. Introduce your fish into their new aquarium as carefully as possible to avoid putting them under any stress.
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