Nitrite/Nitrate Poisoning


Cause :
Nitrite/Nitrate poisoning is caused by an aquarium that has not been cycled, overstocked fish and not enough water changes.

Prevention :
Avoid adding too many fish to your aquarium at one time, complete your aquarium's nitrogen cycle before adding fish and do a weekly water change of 20%.


  • Fish become lethargic
  • Resting below the surface
  • Too many fish
  • "New tank syndrome"

Treatment :

  • In emergencies, 50% water changes will help
  • Using chemicals such as Seachem's "Prime" will reduce ammonia and nitrites immediately. Use as directed.
  • High nitrates can only be removed by water changes.