Reasons behind why average fish only live for 3 weeks after sold

Yeah, once people get to know the basics, it is really not that hard to keep the fish alive and healthy. Unfortunately, most people are not interested in getting to know the basics, because they think they already know everything while what they do is wrong.

I have had a friend who kept a betta in a soup cup. Well it was one of those tiny fish killing bowls. With no filter, no heater. Of course the betta died after just two months. He simple said "It must be too old". Most fish sold on the market are quite young, usually no more than half to a year old. Betta can live for 4~7 years if cared properly.

I wish people pay more attention on how to properly keep the fish. They are live creatures, not some replaceable toys.