02-13-2010, 10:23 AM
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No water changes are needed when doing a fishless cycle. From the sound of it, everything is going as it should. You are in the last stage of cycling. Keep adding ammonia daily. Soon, you will also see nitrites falling back to zero, 12 hrs after the introduction of new ammonia. Once both ammonia and nitrites can drop to zero in 12 hrs, the tank is cycled.
This is when a water change is needed, before adding the fish. Nitrates will read off the chart high. You will need to change out 50-85%. What ever it takes, to get a nitrate reading under 40ppm. (the "safe zone", for fish)
Until nitrites can also fall back to zero in 12 hrs, I would not even bother with nitrate test.
Careful to add a light load of fish at first. Don't want to push it.
Last edited by Twistersmom; 02-13-2010 at 08:29 PM..