I just got a 75 gallon tank and the only thing my husband is insisting on is a school of cardinal tetras. I think Kissing Gouramis are so adorable and they make me laugh for hours with their kissing motions, but I've read that they may eat smaller fish. I really want to get a few, but I don't think he'll let me if they eat his fish. Will they? And if they do, will it be right away, or not till they get real big?