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He already wrote thisYea I've heard the high nitrate thing but never seen a specific number. Some would consider 20ppm very high but others would say 100ppm. Never heard anything about phosphate though. Curious if there is any scientific reason to be worried about either.
@Randy Holmes-Farley
That's nitrite not nitrateHe already wrote this
http://reefkeeping.com/issues/2005-06/rhf/index.php
The internalized nitrite then causes a number of internal disturbances, including loss of potassium from certain tissues (such as skeletal muscle) and the oxidation of hemoglobin into methemoglobin, which reduces the blood's oxygen carrying capacity. This can cause reduced tissue oxygenation, hyperventilation and heart rate increases. Many other biochemical pathways become altered as well, including steroid synthesis, vasodilation (blood vessel enlargement) and changes in internal levels of ammonia and urea. Nitrite detoxification in freshwater fish is accomplished by direct nitrite excretion and by internal conversion of nitrite into nitrate.23
Perhaps this is what you seek.
That's why I figured. Thanks LasseThis is the newest review I could find (2018) Although it is done a lot of NO3 toxicity studies (both acute and chronical) in freshwater – there is not many done in saltwater. Note that most figures we see in this article is as NO3-N and in order to have mg/l (ppm) NO3 – the figures should be multiplicated with 4.43. If you read 10mg/l (ppm) NO3-N (nitrate nitrogen) – the NO3 (nitrate) concentration is 44.3 mg/l (ppm).
It seems like we (aquarists) overestimate the NO3 toxicity even for invertebrates
Sincerely Lasse