I tested my water for my 20 gallon QT this morning because I have a fish that is in jeopardy and the best I can tell the Ammonia is around 0.5-1ppm, the nitrates are between 10-20ppm, and the PH is around 7.4ppm. I am going to add some RODI to the tank today. I currently have the following to treat the tank with.
Marine Buffer - to raise PH
Prime - for Ammonia Nitrate and Nitrites
Would these be good to do what I'm trying to do? Or should I just add the RODI and retest then?
Are you currently running copper in the QT, and what symptoms are the fish experiencing to make you say they are in jeopardy? If you are running copper, do NOT use prime or similar products with copper. They will react with each other, and become extremely toxic. Most copper products contain an amine group which acts as a chelator. This will often cause a false positive ammonia reading. The most reliable way to monitor ammonia is with a Hanna ammonia test, but badges can work too. If there is ammonia present, water changes are the way to go if you want to reduce and remove it until the tank is cycled and stabilized.
Buffer would raise pH, but ammonia becomes more toxic at higher pH values. Nitrite is really only toxic in freshwater, and monitoring it is only applicable to SW as evidence of a disturbed nitrogen cycle. Those levels of nitrate are fine for a FOWLR and most reef tanks.
@vetteguy53081 @Jay Hemdal may have other comments.