I have 2 African Dwarf frogs. One of my dwarf frogs is looking very skinny. It has me very worried. The other looks fine. Also I would like to change their tank because t is very small( less than a gallon) and I am not sure what kind of water to use. The directions say to use spring water but I just want to be sure because of the one that looks unhealthy. Also how often should I feed them. The directions say every three or four days so I have been feeding them every Mon and Thurs but some of the sites say i should feed them every other day. I have had them for about three months and I do believe they have been fine and I dont want anything to happen to them. Any assistance would be Greatly appreciated.