New to Saltwater Aquarium hobby and learning quick! I?'m following the Fishless cycle process and it's suggesting to add 4 PPM of pure amonia to tank to do a amonia->nitrite cycle test. My tank is a Red Sea Max 250 with an estimated 66 gallons of volume. How would I calculate exactly what 4 PPM of Amonia to add to a 66 gallon tank equates to in volume?