Skinny Bent Zebra Danio

[theotheragentm]

I have a Zebra Danio that got skinny and looks bent no on the tail. It's only slight on the bend, but the fish definitely looks sick. I put it in a QT tank with another one I thought looked skinny. This other Danio is doing fine, but that other one will nibble on food once and then move away from it. I've tried all types of food. Any other thing to try?

 

[plecoperson]

I've lost several to whatever that is. I dewormed them and they pooped out lotsa worms, then slowly faded again. Eventually I have had to euthanize them.