Panda cory

[Dinocine]

I'm inclined to believe panda cory is one of the most delicate of its type. I purchased 5 panda cories 3 months ago and 3 died in a mere 2 weeks time. Compared against other cories which I'm yet to see casualty up to date, panda is the cutest but sadly, the weakest too. Now, my 1 of the 2 remaining panda cories is having problem to balance itself in the water, which i suspect a swim bladder problem. I'm  currently treating it but see no obvious improvement, so should I put in to rest?  :'( I feel so sorry for it to float on the surface of the water with only its gills and eyes moving.

 

[clothahump]

I would be looking at water quality or even internal parasites if you are having this sort of problems with Pandas.
They may have been suffering from something that your other fish are immune to, probably wild caught fish that have brought their own death with them.
I would put him out of his misery.