Goob_Scooper wrote:
If your are sure water conditions are fine, then must be something wrong with the fish itself, check for obvious damage to gills etc, however may be parasites/ flukes inside gills which are difficult to detect (pre-mortom anyways)
X2. any chance you can move to another tank(hospital tank)if its in another tank with good water you can rule out tank water and may stop other fish catching anything it may have. if its gill damage moving it may kill it as the extra stress may be to much. so think it over first.