there are a few possibliities.....
1. Transport shock
2. Temp Shock
3. PH Shock
4. Fish not healthy from the very start.
the first point is pretty obvious...perhaps it may not be you but it could have just arrived from the farm. During this period fish goes through alot of transport shock.
Point number 2 and 3 are related. did you float the bag for 20 mins or so and did you allow 100% mixing of water between the bag and your tank?
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