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hi, I just set up my new 35 gallon tank and decided to do the fish less cycle. It’s been a few days and I decided to test the water. The ammonia level is at 8.0ppm !! I didn’t do anything to the water, all I did was add the substrate, start the fliter and heater then let it run for a few days. Is this normal?? Also how do you know if the tank has been cycled?