I have Prime Reef flakes and PE Mysis. Im wondering how much I should feed my two fish? I have a Black Ocelarius and an Orchid Dottyback in my 15 gallon column aquarium. They are smaller fish. The dotty doesn't seem to eat the flake so I usually feed a very small pinch of that in the AM and in the evening I give them a half a cube of frozen mysis. Is this a sufficient amount of food for the two of them or should I be feeding a whole cube?

