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- Feb 3, 2020
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I am starting a new tank using live rock that I have had for 10-20 years. The rock has been completely dry for several years. I mixed fresh salt water. I tested the water and it had 0 ppm nitrate. I placed the rock in the aquarium and measured the nitrates the following day. I measured 10 ppm nitrate. I would expect some ammonia or nitrite, but the tank has not been cycled yet so I would not expect any nitrates. Is it best to use the new rock?