Im not sure if you're trying to prove a point here or what, but all that typing you just did, to tell me that a Catfish isn't necessary, wasn't necessary. Me and the OP both are smart enough to tell you that that arent needed. I also was aware of the fact that some are predatory. But, they are also interesting animals and no matter what you say they help in some aspects. Sure they make bioload, but so does any leftover food. And if the OP chooses his fish wisely he should have too much of a problem with fish being eaten in a 4 foot tank, with only 3 Catfish that aren't super predators and that aren't very big either.
And sure, the BN and the Cories don't need to be in the tank together. But then, we don't need either of them. And then you could say we just don't need the fish tank at all, and we should just let them go into the wild.
The whole hobby is about creating something that you enjoy and appreciate and when you lose sight of that you lose the essence of the hobby. Im not sure if I'm right, but you seem to be a little bit off of you normal respectfulness, and it bothers me that you seem to think that the enjoyment side of things is less valuable than having a Tetra or two eaten, or 10 more PPM of Nitrates a week.
Sorry if that seemed a bit upfront. If you feel it needs a bit of arguing then feel free to PM me so we aren't switching up the topic of this thread, as you have already said your point.
If money cant buy happiness, that why do I need a job? I mean, I should be getting these fish free, since I don't have to pay for happy...