Is it good for feng shui to raise two black and one white fish?

Yes, black and white are the same five elements in Feng Shui, and all five elements belong to water. First, because the black of fish is different from other blacks, black is more accurate for fish. Black and five elements belong to the soil, of course, it is not appropriate. Tuke water is naturally bad for Feng Shui. But this is a fish. The five elements are not soil, but water. So it is feasible.