Hello 1st timer
Lets do a lil math...
two thirds of a cup to 30 gallons.....
two thirds of a cup is about 5-6 oz, and there are 6 teaspoons per oz, so 30-36 teaspoons per 30 gallons, so thats about one teaspoon per gallon if my math is correct.
Hope this helps-
Treemansbuds-