Firefish dying??

[gregzz4]

Sorry to hear about your firefish Zee

Some fish are subjected to all kinds of bad 'capture' and 'holding/transport' procedures that don't show up until after they've been in our tanks for a bit
I've lost 3 fish recently to the same 'unexplained' problem. It's all part of the hobby, unfortunately

Don't give up on the kind of fish, but maybe get one from somewhere else;
A different location/supplier from the same LFS, or a different LFS

Also, it wouldn't hurt to talk to the store you bought it from to find out if they have had losses of the same fish
If the store is honest, and has had feedback from other customers, they should take care of you