I have GFO from BRS and Coral Vue. I have not used the Coral Vue yet, but it look identical to the BRS in granular size and color. The BRS works fine in my tank and 1.5 cups last 30-45 days. I gauge it off of how often I have to clean the glass. Keeping it tumbling is a problem so I mix it with charcoal. I have about a half a pound of BRS left and 2 pounds of Coral Vue.
Gary