When fish die I try to rule out
1) water problems:
toxin-buildup of ammonia, nitrite or other chemical that is introduced to tank
temperature-rapid change of temperature
osmotic shock-rapid change of pH and/or TDS
2) parasite-abnormal feces, flashing, odd behavior, not eating, seeing stringlike anchor worm, white dots (ick)
3) bacterial-slime coat problems, fin rot, not eating, white stuff on mouth or body
4) other--if usual medications don't work, perhaps internal worms or virus
1) water problems:
toxin-buildup of ammonia, nitrite or other chemical that is introduced to tank
temperature-rapid change of temperature
osmotic shock-rapid change of pH and/or TDS
2) parasite-abnormal feces, flashing, odd behavior, not eating, seeing stringlike anchor worm, white dots (ick)
3) bacterial-slime coat problems, fin rot, not eating, white stuff on mouth or body
4) other--if usual medications don't work, perhaps internal worms or virus