I have upgraded my tank to a 90 gallon from a 55. I have used to sand and live rock from the other tank and was wondering if I had to let the 90 gallon cycle. If so how long should it have to cycle for me to be able to put my fish from the 55 in it.
Just monitor the levels. There will likely be a small cycle, but it should end quickly if you used the same water. If you didn't then it will last longer.
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