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I have 6 rummynose tetras in a 20 gallon long tank and have had them for about 2 years now with no problems. The tank had both an Eheim 2213 and a HOB filter on it up until 3 days ago, when I removed the 2213 to use on a different tank. A day later, one of the rummynose tetras showed up dead. Today, another one is very near death. It is struggling to swim around upside down and floats to the surface often. There are no visible symptoms other than being stuck upside down and a slight loss of color. The remaining 4 tetras seem fine. They are not breathing heavily or behaving strangely. I tested the pH, which is a normal 7.2, and the nitrates are 10ppm.

Whatever is happening, I'm thinking it's related to me removing the 2213, but the tank parameters haven't changed drastically. Any ideas what this could be? I just don't want to wake up tomorrow with another one having bit the dust. :(
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