Man this morning I found one of my six marble hatchets struggling against the current from the filter, then about an hour later, it passed away. I checked the water perimeters, and all seems well...Ammonia=0, Nitrite=0, Nitrate=10. I went to school, and when I came home, found another one of the marble hatchets dead. So I did a 70% water change, the water perimeter is Ammonia=0, Nitrite=0, Nitrate=5. Another marble hatchet is dead, now I've got three left. I recently got two spotted cories, and two panda cories which are all really healthy, but the death pretty much started around when the cories came, I don't think it's related but it still makes me wonder. The other fish currently in my tank are six glow-lite tetras, six rosy fin tetras, three angels which are all swimming around like they always do, no weird behaviors. So my question is...are marble hatchets super sensitive to something that the other fish are fine with? I don't know what's going on, someone please help, I don't want my other three hatchets to die. :huh: