Hi All~ I just lost one of my Danios Not sure of the cause. I immediately tested my water and No traces of ammonia, trates or trites. Just did a water change a week ago.

It looked pretty normal aside from the part of the head and tail being eaten. Could this have been an aggressive attack from one of the others? These are the same fish I started with.

Recent changes:
I have been prepping for my tank remodel the past week and have re-homed about 6 of my stock (all different species). I had moved the HOB from the left side of the tank to the right. Nothing too drastic that should stress the fish.

All of the others are swimming about the tank normally as far as I can tell. although they do seem to be chasing one another more than normal.

Any thoughts on this?