Fish Supplies › Fluval › Test Kit › Aquarium Bubble Pump

Nitrite develops when beneficial bacteria break down ammonia. This becomes ext... Nitrite develops when beneficial bacteria break down ammonia. This becomes extremely toxic to fish when high levels of nitrite persist in the aquarium for more than a week. Test weekly. more

Ammonia is produced when uneaten food and waste decompose. This is highly stre... Ammonia is produced when uneaten food and waste decompose. This is highly stressful and toxic to fish if left to accumulate within the aquarium. To know if you have a build up of ammonia test weekly. more