ADFs can be quite hardy. I had one that once lived in a gallon bowl with a betta for years, and she grew big and lived for five years (which I heard is max life span)! They eat flakes, livefood (preffered), frozen food, frog pellets, and some other stuff. They can get up to about two inches. They are peaceful and mind their own business.
after one died in my fish tank I moved the other to my newts tank (with 6 inch newts) and they actualy became friends and it has grown quite large (about 2 inches). It's actualy doing Very well in the tank 1/3rd filled with water.