Is raising two black and one white fish good for feng shui?

Yes, black and white are the same five elements in Feng Shui. The five elements all belong to water. One is because the black color of fish is different from other black colors. For fish, black is black gold. More accurate. The black five elements belong to earth, so of course it is inappropriate. Earth controls water, which is naturally not good for feng shui. But this is fish. The five elements do not belong to earth, but to water. So it's doable.