So Nyx passed away on Friday. I was more sad when he died than the others because I spent more time with him. I have no idea how he died. He was doing so well. His feathers were even starting to peak out. I think he probably died of emotional pain. He was lonely most of the time. His siblings died and I had to focus on my studies. I was definitely NOT ready to have ducklings. Hopefully next time, I'll be more ready and have more free time.
I'm so sorry to hear that he died. I have raised more ducklings then one can keep count of, but losses are always painful. Don't beat yourself up, you really did your best.