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    The first water change:
    1.Remove 1/2 of the water in the tank.
    2.Treat enough water to replace the full volume of the tank with conditioner, but only add about 25% of the new water in. (So that the tank is now 3/4 of the way filled).
    3.Wait 15 to 30 minutes, then fill the tank the rest of the way.
    Taking the first water change slow will keep the fish from being stressed as they slowly adjust to the new water.

    The second water change:
    1.Right after you refill the tank, remove half the water again. There’s no need to fill it up in two steps this time, as the fish are already used to the large water changes.

    After the second 50% water change, wait no more than 60 minutes, then conduct 2-3 more 50% water changes.

    To put this into perspective, say you are flushing out a 20 gallon tank. First, you would remove 10 gallons but only replace 5 gallons. Wait 15-30 minutes before you top it off with the other 5 gallons. Then, immediately remove and replace 10 more gallons. Repeat this step after an hour or so, two or three more times.

    When you are done, almost all of the old water will be removed from the tank, leaving fresh clean water. Make sure you don’t TOUCH your filter media through this process. This will keep your beneficial bacteria colony intact, so they can remove the left over ammonia.

    Tank flushes can be preformed on a regular basis, preventing a buildup of old and depleted water. Some people conduct them every 6 months, while others do them monthly. I find that tank flushes are great if you aren’t sure exactly what the problem is, but you know there is something affecting the fish. I had a goldfish with a strange red mark on his side, and a platy (in another tank, of course) who suddenly started clamping his fins.

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