Okay the problem in my tank has some how gone from bad to worse. My death list now is four. Here are the symptoms. They start of with labored breathing for about a day and thier fins get kinda droopy and they start to become thin looking. Then for another day or two they are hard to find in the tank and they are just staying on one spot and swim a little, now they are not eating and then they find a spot to die where they stay for about six hours. Still all my parameters are safe. What is going on...my tank is now cycled and they all lived through that...what is going on....Please help. I also have an adult female swordtail who is looking like she may be dead my morning, a female guppy who’s previous problem is all gone and was gone in about an hour after i posted, and about ten guppy fry...what do i do?