wow bronze/emerald cories are usally very very hardy. How do you acclimate your new fish? Do you qt? what are your water param. and whats in the tank?
I quarentine in a 10gal for 5-7 days depending on how quick the fish color & behavior seems to improve. The cory's looked to be doing fine. Every morning after the first 48 hours, one would be dead. The 2 remaining have been moved to their permanent tank and they have great color and are always scanning for food. I forgot to mention that the LFS refused to warranty the Cory's, they claimed they aren't hardy at all. They sold me the Cory's for 1.25 each. Very cheap.
I also had 6 False Cory's in the QT tank about a month ago, 3 died within 48 hours. The other 3 are now in their permanent tank and they appear as healthy as could be. There is a few schools of small Tetra in the tank, that's it. Water Parameters are always ideal.
My acclimation process - I have a 2.5 gallon bucket that I fill with the bag water and fish. Every 10 minutes for an hour I add a half cup of tank water from whichever tank I'm going to move them to. I have a small submersible heater that I heat the water to match the tank. Whenever I add fish, I leave the lights off for 24 hours.
I have a few friends who all suffer from fish loss when buying new, but they don't acclimate so I can't really compare to them.
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