Dwight Posted November 17, 2021 Share Posted November 17, 2021 Last week I posted about cycling issues I was having, and after getting some good info, I went back and checked and saw the parameters have been 0, 0, about 40 and pH 7.0 nearly two weeks. Again, thinking my tank was cycled, we went to a fish store (not Big Box Pets) Saturday and bought six Zebra Danios and thee Mystery Snails for our 20 gallon tank. We also got a couple live plants. There were no other fish in the tank and a little algae. Things seemed to be going well but when I came home today, I noticed that rotten egg smell and saw the fish were not as active as they have been, lethargic. I tested the water and still had 0 Ammonia, but Nitrites had spiked to over 1.5 and Nitrates were near 140. I did a 15% water change and the Danios immediately swam to the surface, the smell intensified and within ten minutes four were floating belly up and the other two were struggling. I did manage to get those two of into the 10 gallon but they don't look like they'll make it. I'm not sure where the parameters are there, but leaving them in the 20 would not work based on the other four. What have I done this time? And why the spike in egg smell so quickly? Link to comment Share on other sites More sharing options...
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