How do I know if my cory catfish is dying?

You know your cory catfish is dying if it displays the following signs of poor health:

  • Weakness and lethargy
  • Slow swimming, or none at all
  • Upside down swimming
  • Refusal to eat
  • Gill discoloration
  • Troubled breathing, gasping at the surface
  • Clouded and bulging eyes
  • White spots on the body
  • Cloudy mucus covering the body

Your cory catfish may be exhibiting these symptoms due to an improper acclimatization process, water temperature or pH changes, poor sanitation, water poisoning, or self-poisoning due to stress.

To prevent your corys from dying, keep them in groups, feed them a healthy diet, maintain the tank regularly, and keep them away from aggressive tank mates.