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Now that I have changed more then half of the water will the tank have to go through it's 'cycle' again?

I have recently moved my tank which required me to take out about 50%-60% of the water (65 gal;salt).? I had no fish in the tank at the time.? About 3 months ago I lost all of my fish due to a water change I had done.? So I'd say the tank has been lifeless for about 3.5 months.

You will have a cycle anytime you add new livestock. However, if you add one or 2 fish to an existing tank the cycle will not be noticeable. But if you add 10 fish you will definitely have a significant cycle.Or liverock because it has so much die off usually produces a cycle.

If you have a fish only tank or a reef for that matter as long as you add livestock *gradually* the tank will be able to adjust fairly quickly.

Here is a reference about cycling and another reef cycling page

Robert

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