Can too many water changes hurt a cycle? - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 4 Old 07-16-2014, 02:46 AM Thread Starter
Can too many water changes hurt a cycle?

After a week I'm now on step 2 of my aquarium cycle in my 20 gallon.

Ammonia is at 0 as of yesterday and still yet today it's zip. I'm doing daily water changes of 50-60%.

Nitrite today was quite high, 2.0ppm and Nitrate was at 40ppm.

I did my water change of 60% and tested again about an hour later.

Nitrite 0.25ppm and Nitrate 10ppm.

Which is obviously better, but still high. Would I hurt it any by doing another 50% water change tonight to try and lower it any more or would taking too much out like that disrupt the cycle?
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post #2 of 4 Old 07-16-2014, 08:17 AM
Are there fish in the tank or are you doing pure ammonia?
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post #3 of 4 Old 07-16-2014, 11:48 PM Thread Starter
There is a YoYo Loach in the tank. I didn't exactly want to do a fish-in cycle, but it so happens that he was a hitchhiker hidden inside a piece of driftwood I bought and I had no where else to put him. So, there is a fish in there.
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post #4 of 4 Old 07-17-2014, 12:37 AM
Do water changes any time your ammonia and/or nitrite gets over 1ppm and your nitrates are over 20.
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