Shouldn't be keeping crawdads with a slow moving bottom dweller like a lungfish. If you haven't already, ditch the crawdads, add some melafix to your water and maybe a little salt to aid in the healing process. Turn up the heat a little bit and make sure the water quality is really good, 0 nitrites, low nitrates, good ph for your lung depending on african or south american and hopefully it will recover in time. As its been said, if they do recover it will probably take a few months. ~Trent