ok so i test my tank every other day and also do a 25% water change and still cant get my nitrites down. there still at 2.0 for a week. while my ammonia is at zero and my nitrates at 5.0. these numbers stay about the same with not much change. any help other then using a chemical to get the nitrites down.
4. i have 2 penguin bio-wheel 350 and a whisper 100 bubbler
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