I do not see a carbon source listed on the MB7 ingredients which I guess this is why they say to dose Reef Fuel or other carbon sources to assist MB7. Vibrant does list Vinegar in the ingredients(at least my bottle did). Vibrant's claim to fame is that the bacteria culture used specifically targets and eats algae. Whereas it appears MB7 bacteria targets waste, food, etc. I am wondering if the bacteria used in Vibrant(which is a PROPRIETARY blend) does more than just target algae. Again, just a theory.