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nitrogen cycle


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I'm a new aquarist from Austria. I started my fishtank 2 months ago with a few platys and plants (now I have 7 adult plays, 5 corys, 2 siamese alga eaters and 10 baby platys). from the beginning I've had a constant level of ammonia (according to my test it's always around .05), constant nitrites (.025) and almost no nitrates. it's seems that no matter what I do these levels remain the same. I started doing weekly 25% water changes, then I left it for 2 weeks, I added bacteria too. my hang on the back filter has half sponges and half media. i'm not sure if this is problem or not.




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