Orange Platyfish die suddenly

Compared to goldfish, betta fighter fish, platy fish, neon tetra fish do not live for long in a fish bowl.
The orange platy fish are costing Rs 50 a pair in most of the aquarium shops in panaji. Some of the aquarium shops do not have stock of platy fish as they are getting the fish from suppliers outside goa. There are relatively few breeders of ornamental fish in goa .
4 orange fish had been purchased and within a few weeks all the platyfish were found dead on the same date. Any information on the cause of the death of the platyfish will be greatly appreciated.
Research on keeping fish at home continues.

Atlantic blue tang

orange shoulder tang double tail betta

porcupine puffer fish

crystal red shrimp

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