McCosker's Flasher always die, why?

smilodon

New member
I recently bought a 2 McCosker's Flasher from LFS,
and they were eating well, and swiming around in the tank,
but first die in 2 weeks, another one die after 1 week the first die.
before they are diying, there is no sign of sickness.

And then I bought another 2, same thing happens, they're all die
in 3 weeks, this time I put these two in guarantine tank, and then I noticed
before they die, seems they're all of sudden losting control of buoyance.

This all happened really quick, like I just feed them 2 hours ago, and they
eat very happily, and all of sudden, they're acting like they lost the control
of buoyance, and the body is upside down.

I am sure my tank is clean and no predators, all other fish are health.

Is there any possible I got the poisoned fish, or they are poor in shipping.
Or they are very sensitive to the water parameters. I just build this new
50g tank and it's only been less than 3 months old.

I bought those fish from same LFS.
 
Maybe bad fish from supplier since you've had a pair die in DT and in QT
 
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