Originally Posted by tink77
If they just kill each other on site, you would not have any in the wild.
There is a vital flaw in this statement. The aggression of domesticated betta splendens is a human invention. Think those flowing fins and bright colours are found in the wild? They aren't and neither is the aggression. These traits were developed over centuries of selective breeding. Your bettas have never ever existed in the wild and comparing them to wilds is like comparing apples to oranges. Many species of wild bettas can be kept together in aquaria far more successfully than domesticated bettas. Furthermore, wild bettas establish and defend much larger territories than what your 55 gallon tank can simulate anyway, so it's a moot point.
I am not attacking you or your years of fishkeeping expertise. In fact, for the sake of your fish, I really do hope this setup works out for you. I am simply stating my opinion. You post on a forum and you are going to have to expect to get feedback postive or negative.