No real special needs. Just make sure it gets enough to eat, it’s a little on the thin side. If there’s aggression or dominance from the other fish it might stay near the glass to protect its blind side. If there’s none of that I wouldn’t worry about it...
My last one was 16”, in a 6ft x 2ft 180g. They’re not a very bendy fish and it couldn’t turn round without doing a three-point turn. The tank was too small, imo.
Incidentally they much prefer a pipe to a cave. I use sections of guttering downspout.
The Asian ones (Pseudomystus) grow to about 6” max, so they’re physically incapable of eating a Red Tailed Shark.
The thing is they’re nocturnal, so could be damaging the shark in the dark when it’s helpless, especially if it’s hungry. How big is the tank?
“Although recognition of individual species has usually not been difficult for field workers, a substantial number of secondary publications (aquarium literature, etc.) gives the impression of a rather chaotic systematics. We believe that this is mostly due to a lack of familiarity with the...
If bloodworms are anything but vivid bright red, do not feed them... and once they’re thawed I wouldn’t refreeze them.
When I have the big blocks I just break some off as required... or break it up into smaller bits.