Today wasn't a great day as I came home to find one of my 4 auratus froglets dead.

I was hoping someone could provide some insight into what might have happened as I think this particular froglet may not have been eating enough. It seemed quite skinny compared to the others. Although I have witnessed it eating recently, I'm wondering if maybe the others were getting the majority of the food since they seem to respond to the food immediately as I place it in the tank. The froglet that died was not so responsive for the past few days. Hopefully someone can provide me with some good info as I do not want this to happen again.