Most pet stores do not provide the correct information on how to take care of the pets. Someone had pointed it out earlier pet stores never care about the pets. They want nothing more than profit.
Betta fish in a pretty vase with a plant in it was pretty popular a while ago. It was nothing more than a marketing technique. It looked so "perfect" while in fact it was a death trap for the fish. There is no filter, there is no heater, and there is no food. A nurse at my dentist was even telling me "the plant root provides all the food source for the betta". Betta is carnivore, and they eat mostly insect larva in their natural habitat. Of course even I will chew on the root if I am hungry enough, it doesn't mean I will survive for long if that is the only food I can get for the rest of my life.
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