I don't know much about the paprika, but a major reason other than basic nutrition, that the hikari works is the Astaxanthin and spirulina. These are naturally occuring food ingredients in the wild that only some fishfood brands mix in. In high concentrations your fish store them resulting in more deep reds and blue-greens. Hikari is not the only brand that has it, infact Chingmix has it in very high concentrations. Flowerhorn keepers who care about their fish use it in place of dyes and hormones because it is safe. I use it on all my sa and ca cichlids and it has given lots of color to even the young 1" fish.