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My Tank Won't Cycle


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  • Regular Member

Hello I need advice


I have a 75 gallon tank and it's been cycling for 8 weeks.  I did a 90% water change yesterday but it has never fully cycled, my NO2 levels has always been high.  What should I do now?  Should I add more NH3 or let it sit for another week?  My NH3 levels are about 1ppm and I know by now both NH3 and NO2 should be zero :(


Thank you


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  • Regular Member

I assume you are doing a fishless cycle.  


If you currently have 1 ppm ammonia, you shouldn't add more.  What level of nitrite do you have now?


What ammonia and nitrite concentrations did you have before the 90% water change?  


What filter do you have for the tank?

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