I have a 28 gallon that I am planning my fish list for. I really like the banggai cardinal, but I have read that they do better in pairs. With it being such a small tank, if I have 2 of the cardinals, it doesnt leave much room for other fish. I would like to just have 1 cardinal, but if it isnt going to go well without another partner, I wouldnt get it. So my question is how important is it that the cardinals be kept in pairs, or will it do just fine if I just get one. Thanks.