I don’t mean this to be directed at you but it seems half of MFK keeps their fish in far more overstocked sad conditions and on top of that in a plain glass tank. The other half seems to think the rapture is coming if the wrong fish gets stocked in someone else’s tank.
I can agree with the arowana outgrowing a 72 inch tank rather quick although I plan to have a 300 (96 inches) in year and half or so. I think the rest is rather doom and gloom thinking the bichirs or eel can’t make it lol I also think it’s reasonable to be weary of a wolf fish with any other tank mates but I think with proper shelter, spacing, and sizing it’s achievable.
As for the suggestions I think the butterfly fish are a good alternative and trying to max them out at 5 inches would be fun as you don’t see many of them around. I think the point of the thread was just to see if anyone had experience with larger predatory fish just demolishing smaller school fish or are they too small to be bothered type of thing. I appreciate all of your feedback and will maybe hold off on the arowana.