You should still supplement with pellets, frozen foods, other types of live foods, etc.
Even in the wild, just because they're carnivores doesn't mean they only eat fish. In the wild they would be eating bugs, crustaceans and anything else in the water that caught their attention. Not to mention a wide variety of fish whose stomach contents would consist of bugs, crustaceans, mollusks, plants and anything else THEY had eaten.
My mbuna are primarily vegetarians because their diet is primarily algae, HOWEVER, they will still chase after and eat small fish, crustaceans and other creatures, so I'm doubting that in the wild they ONLY eat algae.
Feeding just one facet of a fishes diet does not make a healthy fish.
So hopefully you're not planning on feeding only fish, because that wouldn't make for a well rounded diet no matter how many species of fish you fed them daily.