N03 is Nitrate, I've never had bacteria stall out due to high Nitrates.
NH3 on the other hand Ammonia, if too high can stall out some of the bacteria so if your ammonia level gets way high then a water change may be needed to get the cycling process back under away.
I have found if N03 levels rise to high your bacteria will stal out try water change that should help
Ok sounds like you just needed a little more patience. What are your nitrite levels looking like now?
I'm now raising bluegill but it is only my first season with them so I can't tell you much yet. Having grown up in Michigan we caught a lot of bluegill when fishing up there. Good eating as long as you don't mind cleaning small fish.
I have been cycling for about 3 weeks. I initially add some ammonia waited a day and checked the level with API test kit. It was .25ppm so I added more and got it up to 2pmm. I have also added bacteria in the mean time, two doses a week apart. I just checked the level again and it is down to .5ppm this afternoon. The tank is fishless and plantless, however I am preparing plants this evening to place in tomorrow but they are seedlings.
When did you start the fishless cycling?
Check the ingredients on the pH down since some hydroponic pH down products will really add way too much ammonia to a system.
What test kit are you using?
Have patience it can take a while for the cycling to happen.
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