We bought two molly fish and a few days later, she gave birth. All the fry appeared to die. And we managed to save 3 babies but they had died. And we had not changed the water because we thought it would cause stress in a new environment and we didnt know if there were any fry left. The next day i noticed that the father was dead behind the filter and the mom was breathing and struggling to swim. She is now dead. I think they had ick and we put a tablet of ick treatment in. But im not sure what happened.