A friend of mine is getting out of the hobby and just dropped off a bunch of stuff off. Among them are 6 tanks that he said were labeled "betta tanks". I've seen them before, the tanks are 12"LX6"Wx6.5"H. I can't really think of what to use them for. My only thought were bettas. Is it possible to house 1 Male betta in each of these? I would just run sponge filters on them along with live plants, thoughts? If not then I'm just going to toss them as I can't see any other use for them.