Thanks for your advice. I'll take care of the water change today and post as much info as I can. His bloating is only in the abdomin and his scales are fine, not sticking out. I don't use ph & kh kits. All I have ever used is water ager at water changes. I have never had sick fish to need to use the kits. But then I've never bread fish before either. I use multicure for white spot, but that's it. I understand that an increase in population can mess with the water conditions. What are they meant to be? As i've never used them before.....Please, keep the advice coming.