Here's the dosing I have found: "Did some research. Max salt dosing for increase of O2 intake, and minimize nitrate, amonia issues max salt dose is 1/2 ounce/gallon. The higher doses are more for treatment than prevention."
Have a friend double check your conversions if you are using a larger system. My friends suck at math, so I bought a digital scale from Harbor Freight and had a converter built in. I prefer to use Epsom salt, as it's cheap. I treated a 330 gallon volume tank, and saw visible relief of stress in minutes....no exageration.