Some of you know the story of this catfish that began here
https://www.planetcatfish.com/forum/viewtopic.php?f=13&t=36790&hilit=mystus
When I got it in 2009-2010, I was ignorant and didn't even know I was getting a Hemibagrus. I thought it was a Mystus.
It's been very easy to feed. A good tank mate, nothing of the wyckii or wyckioides kind. Grew from 2" to 1' in about 1.5-2 years and stopped completely there. It's been 4 years or so since it remained the same size. They are farmed in Asia and it looks like my farm boy (or girl) is a cull, failing to reach its supposed max size of 2'+.
It's very relaxed and likes swimming around day or night and checking everything out. Quite active, again in complete opposition to wyckii and wyckioides.
In the 7 years I've had it, I saw it eat a 3" koi once when they were in a 1500 gal pond. Never before nor after has it done it, although it could. In the same pond I saw it chase other fish from its spot (that was ~3 years ago) but the spot was small and the chasing was not vicious and everyone complied anyway. Funny enough, it has not done the chasing ever before or after, again. It ate the koi exactly the same time. I think it had an episode. Maybe a teenage meltdown that came and went.
It has been in a 4500 gal for a year or more now, a model, upstanding citizen, not a scratch on it but never fighting anyone else. The activity you will see here is typical. It also takes rests in the center on the bottom in between these rather energetic swimming laps.