You are absolutely right. It was just a fluke for me. I figured it’s worth mentioning just because there is potential for it, despite being so unlikely.I disagree with that statement. A dwarf gourami isn't capable of eating a cardinal tetra unless you are talking about a full grown 3.5 inch gourami with a half inch cardinal. Which you aren't going to find that small anyway. Cardinals get up to 2 inches so a little larger than a neon. That must have been one large betta and some tiny neons. I would say that is the exception rather than the rule.