I should add that I don't have the Betta yet, he's just on my list. I was waiting to see if I was going to do Cardinals or not as I probably won't mix a Betta with them, they just aren't too nice (generally) with small, slow fish. I've heard Congos can be a bit testy, and I can always get a Gourami of some sort instead of a Betta and do Congos. I'm mostly not wanting to do Cardinals because they might hide quite a bit even though my tank is heavily planted. Dwarf Neons were my first choice so I'm tempted to just stick with them. Thanks for the input!