Aquarium Nitrates Oct 6, 2018 9:35:26 GMT -5
Post by Carl on Oct 6, 2018 9:35:26 GMT -5
"Aquarium Nitrates; Lowering Nitrate Levels, How to Control"
This article from our "Aquarium/Pond Answers" library has been updated.
Here is an excerpt:
Although much less toxic than ammonia and nitrite; Nitrate (NO3) as a nitrogen compound can also cause stress making a fish’s organs work harder to adjust to their environment, especially at levels higher than 100 ppm in many fish.
The increasing stress results in the loss of ability to fight diseases, the ability to heal itself, and the ability to reproduce.
It is essential for you, the aquarium (or pond) hobbyist, to maintain a proper environment for your aquatic companions. High nitrate levels are often a sign of poorly maintained aquariums and will cause problems in the long term.
As a GENERALIZATION (which is the general consensus among experienced fish keeping sources, but also not totally agreed upon), I recommend maximum levels UNDER 40-50 ppm for FW (shooting for numbers under 10-30 for more optimum conditions for many inhabitants).
20 ppm or less for Saltwater fish, & under 5 ppm or less for reef aquariums. For planted freshwater aquariums, about 15 ppm is suggested (or even higher, as too low in planted aquariums can be a problem).
It is also noteworthy that very low nitrate levels in an established aquarium does not necessarily mean that the aquarium is not cycled. As often a low bio load and/or aspects of natural nitrate reduction such as plants (or Pothos), refugiums, anaerobic de-nitrification filters, etc. along with nitrate lowering methods such as Algone, NPX Bioplastics, Protein Skimmers, etc. can IN FACT keep nitrates at near ZERO numbers. I've seen this 100s of times in my career with my client's aquariums.
If levels exceed these generalized numbers for a LONG period, NOT just a day or even a week, coupled with other water parameter factors such as poor Redox balance, over crowding, poor feeding, and more, this can and will affect long term fish health."