Thanks for responding to my post so fast. Let's see, I will try and answer your questions.
* Yes my tank if fully cycled & has been up and running for about 3 months now.
* The water parameters are all normal, I checked them before my problem started. (I did a 25% water change)
* My community tank consists of a variety of 13 fish that were all added a minimum of a week apart, sometimes more.
2- guppies
5- platties
2- molly's
4- glass fish
* The fish have no marks dots or patches on them, nore do they look bloated.
So you see why I am baffled. I thought it might be that bloated bladder disease at first. Can fish get that if too much water is added to fast to the tank ? I'm reaching I know, but ya never know.
Terry