For the most part, aquatic frogs are pretty tough. I would not use salt unless you suspect bloating. Because these frogs live almost exclusively in water, proper water chemistry is a must. I have been keeping aquatic frogs for many years and use Stress-Coat to condition the water. I also understand that bloodworms may not be the best for ADFs since it causes bloating and does not provide adequate nutrition (even though they love them). I have had a problem with my frogs being overly active, swimming up and down and jumping out of the water - I realized that I forgot the water conditioner, once I added some, the frogs settled right down. Also ADFs have been known to exit the water on occasion, so your escapee may not have been an accident. I have the least experience with ADFs - I keep ACFs and Surinam toads.