fishless cycle ?

When your ammonia and nitrite levels are at zero, and you are showing some nitrates, then your cycle is complete.  I've never done a fishless cycle, so I think the nitrates are probably very high.  If your tank is cycled, do a massive water change, like 75%, refill the tank, and add your fish.    Make sure your nitrate level is below about 10 before adding your fish. 75% is a guess, and you may need to change out more than that to get the nitrates down to below 10.
 

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