An update on the inhabitants of the other part of the same tank behind the divider: 2 dourada catfish, one B. capapretum, and two giant Siamese carp.
I've been having horrible luck with the dourada catfish. Probably over the last year or two I tried about 10 of them, at some point having 6 all at one time. Two were lost to predatory attacks by a gulper (missed the size disparity that creeped up on me because of different growth rate) and, totally unexpectedly, by a piraiba. The rest succumbed to some unknown to me disease, wherein they start spinning and swimming funny and never recover, some within weeks, others after many months. Currently have two in this tank section - one from Mark Chen of Discus Origins at ~5" and one from snookn21 at ~3.5".
As a result of these troubles, I became convinced that I must grow out dourada separately or with the meekest of tank mates to have any shot at raising them to size. Sad to report that after all these attempts, my biggest fish didn't exceed 7"-8".
The story with false piraiba, aka B. capapretum, is pretty similar except that I have not lost any yet - only ever worked with two and, miraculously, still have them, one 2-year old at ~2' and the other that I got this spring, featured in this video, at ~7". But they are very skittish and very touchy and too meek with other tank mates and stress way easily, just like dourada are.
So with capa too, I decided I must by all means try to raise them solo or with most gentle tank mates. In any case, IME and IMO dourada and capa catfish require a LOT more vigilance and observation than others to catch problems in time.
The giant Siamese carp I got from Rapps this spring too. Slow growers and exceedingly shy, they have been pestered in their original tank, so they are in this section until I figure out where to place them. They are ~6". I still have a 16" pair in 4500 gal.