3 deaths :(
So today is water change day, and just before I started I was checking out my fish. I found three day and I'm pretty sure it was over night. A neon, cardinal and a tummy nose. I'm not sure why this happened. I tested my waters and everything seems normal. The only thing I've changed was that I started adding excel about 2 weeks ago to help with algae. My tank is a 90g, injected co2 light on for 6.5 hours. I hope it was just a fluke.