William_ Posted January 29, 2021 Share Posted January 29, 2021 My wife and I have recently dove head first into this hobby and we love it. I am a bit confused about the water changes on a cycled tank. We have a 29 gallon that has been running about 2 weeks. I tested the levels along the way and when I saw the ammonia make its way into being nitrates at a concentration of 40ppm I did a 50% water change. tested again and they were just under 20ppm maybe around 10ppm. After a few days I did another water change and the levels were around 5-10ppm (I have the API freshwater master test kit). My question is : We got some guppies to put in the tank and of course then came fry. Just before this happened we had a huge nitrite spike of 5ppm. I did the necessary water changes to get that back to normal and everything has been fine since. The real question, is doing to many water changes going to hurt the fish? Even if both types of bacteria are present and doing their job, will removing and replacing to much water hurt the cycle and is it dangerous for the fish, especially the fry? 1 Link to comment Share on other sites More sharing options...
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