03-15-2007, 09:17 PM
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If I can jump in here:
First, I am so sorry to hear about your danio.
I highly recommend a liquid test kit rather than strips, and I'm sure everyone here will agree. They get a more accurate reading.
I agree with musho .5 for ammonia is REALLY high. 6.0 is absolutely equal to death for fish.
I'm also concerned about your Nitrate reading. To be totally honest I'm having a hard time understanding a reading of .50 ammonia and 200 Nitrates and your fish being alive. There is definitely something wrong here. What caused the death of the danio I have no idea, but I'm sure whatever it was was influenced by the tank parameters being very off.
I personally think that it might be a combo. A little overfeeding, combined with not vacuuming enough, not replaceing filters often, and not changing enough water. Someone once suggested I test my replacement (tap) water too, which I highly recommend for your situation. It could be something in the water.
Get everyone's suggestions and make an educated decision as to what course of action you are going to take. My suggestion is to do a massive water change (after testing your tap), while vacuuming your gravel to get out all the "gunk". I would feed once daily, only what the fish can consume in a few minutes. Test your tank with a liquid test kit and test daily until this is figured out.
We will try and help you fix it, whatever it is!