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I've been dealing with a cycle crash since december, and last week it looks like I was getting some real bacterial growth, ammonia levels were <0.25ppm for a solid week, did a water change, then did a water change two days later because although ammonia was consistently <0.25ppm there have been elevated nitrates in my tap water, it's been 3 days after that and ever since the ammonia levels in my tank keep increasing, like it was never cycled. Test kit is two weeks old, kept in a drawer under my desk, I did shake the test vigorously for each test. What's going on? What should I do?
Also stock is:
6 CPD's+ 1 fry
8 Corydoras habrosus

in a 15 gallon tank

Also filtration is two sponge filters, one running on an APS 100 and another running on an APS 150

 

Edited by Clockwork-crow
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This might not be a cycle stall at all, In my experience it's not unusual for the ammonia test to read .25 from the API master test kit.  It's probably a false positive and has been mentioned often on the internet.  My tanks have been established for years and always read .25.  You needn't worry unless your ammonia results are .50 or higher, then do water changes.   What are your nitrates testing at? As long as they come in at 5 to 20ppm you are doing great.   If your fish are happy and you see no unusual symptoms... you are probably doing just fine! :classic_smile:

Edited by Trish
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