Lets not start an argument. What we can do instead is help correct the problem so it doesn't happen again. We can do this by suggesting to find a nice calm boy/girl betta and then watching them for a few weeks to see how agressive they are. If they seem to mean then don't add. But if they seem fairly calm then gice it a whirl. But fish eating other fish is a problem with keeping communtiy tanks and a risk that need careful thought.