10-19-2008, 10:15 AM
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This has bad idea written all over it. First off half a gallon of water is pretty insufficient for a betta. Second unless you cut off the top and replace it with something you have no way to get the betta in unless you jam him through the hole. Third, without some kind of opening to admit oxygen your betta will drown rather quickly. Fourth, without said opening you have no way to get a filter into the "tank" and the only way to do a water change would be to unscrew the cap and pour it out which has stress written all over it for the betta. Fifth, no way to get a heater in. Sixth, its not going to be pretty to look through for long and will always be highly distorted.
Get a proper tank.
Finally, yes, you can melt bottles together, but I wouldn't trust the joint to be water tight. There's a fine line between softening, melting, and fire with these kinds of plastics.