So, what isProbiotix?Its the Spectrum Nutrition Formula combined with our own mix of beneficial probiotic cultures at least 3 million per gram. These add to the beneficial organisms that live in your fishs gut and help aid digestion more of the nutrients your fish eat are absorbed and converted (this is called utilization ratio). Our proprietary probiotic mix has an extra benefit: we added phosphate-eating bacteria that works in the gut, but also gets into the water column along with the waste and from there into the filter media. The result? A virtuous cycle in the aquarium that works in the gut, the water and the biofilter.