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I got a cycling question.

3K views 9 replies 4 participants last post by  GOURAMIKEEPER83 
#1 ·
Are you or are you not suppose to perform water changes during the cycling process? Also, How often should I perform my water test at the beginning of cycling and during it till completion? After the cycling is complete should I perform a 10% water change twice a week or just once?
 
#2 ·
Are you doing a cycle with fish?
If so, my goal has been to keep ammonia and nitrites under .25 ppm. Its best to only use fish, that are said to be tolerant of ammonia and nitrites. Some fish, .25 ppm would be to much.
Test at least daily, while the tank is cycling. Be prepared for daily water changes if needed.

Once the tank is cycled, water changes depend on how heavily the tank is stocked and how much water needs changed out to keep nitrates under 40 ppm. My tanks, depending on what type fish I have in them, get 25%-50% of the water changed out weekly.
 
#6 ·
If there are no fish in the tank, add enough pure ammonia to bump the tank up to 3-4 ppm. Test daily. Do not add any more ammonia until you see a drop. Then start bumping the ammonia back up to 3-4 ppm daily.
You will see a nitrite spike. Keep adding ammonia and testing daily. The cycle is finished when both ammonia and nitrites test zero, 12 hrs after bumping the ammonia up to 3 ppm.

Then you need to test for nitrates. You will need to do a large water change to lower nitrates under 40ppm, before adding fish.

The biggest mistake in a fishless cycle, is adding to much ammonia. Over 5 ppm, it will stall the cycle. Turning the heat up to the high 80s will speed thing up. The whole process will take anywhere from 3-8 weeks. If you have any cycled filter media, it will help seed the cycle.
 
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