Originally Posted by Buckeye_Robert
wouldn't there be a NH4 and NO2 reading also?
he said that they both Ammonia and Nitrates are at "0"
No, the NH4 is rapidly converted and your test kit might not be able to resolve at low, but still toxic levels.
I would suggest it is more likely that low levels of NH4 and O2 as well cause far more toxicity than NO3.
You can measure NO3, but low levels of NO2/NH4 can still do damage, especially at developing stages.
I've not seen any issues with KNO3 dosing personally with CRS's, Cherry, or Amano shrimp at fairly wide ranges.
Also, while NH4 might not be tested at a good resultion, when you test also can make a difference.
Most folks, maybe 99.9% of them measure NH4/NO2 after the the fact/death, long after the spike may have occurred and the NH4/NO2 maybe already be NO3 or sequestered plant tissue.
A simple test, one that I have done, is to test your idea that NH4 kills, and NO3 does not.
We may add both to some Amano shrimp and see.
When do you suspect you'd see death of Amano shrimp with NO3?
Go ahead, please tell me, do not believe what I've told you, test it your self and use a calibrated NO3 test method also, something few aquarist do, maybe 99% don't calibrate and then those that do, are not doing it right many times
Next add low levels of NH4 and note responses.
The NH4 is far more ephemeral, much like CO2 and O2.
All of which are clearly more toxic and deadly than NO3.............
Do not use correlation and non confirmation as a method to see, ghost, amano and cherries shrimps are fairly cheap and make good toxicity subjects.
So if you want to show cause, add the critter to the solutions and then make a mortality dose response curve. It was until I got out side the range of my NO3 test kit did the shrimp start to die which has at 120ppm, the 160ppm was estimated based on dosing the weight of KNO3 to volume of water, it may have been higher than 160ppm, but it could not have been lower.
No fish deaths or stress was noted in the acute 3 day exposure.
I have not done the NH4 test yet.
Like I have all the time to test or something, more aquarist need to test so they can answer their own questions. Then perhaps fewer would come to such conclusions.
Folks readily give ranges they think might be good or bad, but they do not follw up with a test to see or not what they claim is true.
That's bad for the hobby.
Folks think that means it's true, and if you amplify this mob rules mentality, pretty soon everyone believe it to be true.
You must be more careful than that.