These are hard fish to keep alive, mine lasted 2 years, a bit longer. Not close to their lifespan of 15 years.
They are hard to get feeding and only take 'worm like' foods and are easily out competed.
I've seen loads of these, just not getting any as they are hard to keep. I think all are wild caught? So may need live food to start with, before being weened onto frozen foods.
Yes, they are sensitive to medications, though there are ones fine, I'd run a UV filter to stop parasites anyway.
The ones I see in LFS also shoal, not to sure on this though.
Overall a very nice fish though I just think you shouldn't get a fish that probably won't survive.