Sorry to hear about your frogs. The dwarf aquatic frogs, like all the frogs in the clawed frog family, are very sensitive to water conditions. Like mentioned in the previous post, you will need to condition the water or use bottled spring water (which can get expensive). I have been keeping these frogs and their larger cousins for many years. The water conditioner I use us Stress-Coat, but any good quality conditioner will do. There is a lot of great information about the care of these frogs on the Aquatic Frog forum or you can check out a highly recommended website http://davidcecere.pipidae.org/