guppymonkey
Fish Herder
I don't quite see the justification here. How can any tank be better than the wild? At least in their swamp they can choose to swim elsewhere if they don't like the conditions, whereas in a half gallon tank they can't do anything if the water becomes bad. Since they have lived there for ages, their environment can't be all bad for them. They're adapted to low oxygen and don't have problems with it, and I don't think human feces (in the wild that is, where they are quickly broken down into other things) are much worse than whatever chemicals (such as fertilizers) or compounds exist in a tank.
Human feces are hardly broken down quickly. Unlike herbivore manure (like from cows) human feces contains very high amounts of meat because of the diet that most people have. Also human digestive systems aren't very good at breaking anything down. So the human manure takes a long time to break down especially when the natural oxygen levels are low and the bacteria that break down the maure use up the rest of the oxygen. As for them being better or worse then chemicals in a tank I would have to say that poop is worse then anything I put in my tank. I only use the dechlorinator.
The argument that its good for the fish because they have always lived there isn't valid either. Just because they have lived there doesn't mean its good for them. People live never Chernobyl in Ukraine but I doubt its good for them because they have lived there for generations. Over thousands of years bettas grew used to low oxygen levels but that doesn't include the water pollution that has become even more of a problem as civilization has grown.
The fish trade betta is a completely different specimen than the native betta anyways. I doubt the domestic betta would last more than a few days in the wild. Like the fancy guppy, the domestic betta has been imbred to the extent that it has different needs then the wild betta.