the common myths bit is a bit "GRRR...IM ANGRY!!!" mabey just put the facts rather than personal opinion, people will take it in more easily then.. rather than "well thats just her opinion" for example id remove the "So tell me why in the world they would be happy living in a 1 litre glass circle?" its too "personal opinion"
id put it more like. "so therefor its a myth they are comfortable living in such small spaces, when they come from large but shallow expanses of water. the biger the space, the hapier and healthier the betta"