There is a popular set up where you have a Betta fish in a tank with a plant. The Betta fish eats the plant roots, and the fish waste is taken care of by the plant. DO NOT DO THAT! Bettas are insect eaters, so they have to eat meat. A betta may nibble on the plants when he's starving enough to do so, but its not nutritionally complete, and he will starve to death.
There is another myth that bettas don't like space, and would prefer a one gallon tank to a ten gallon tank. This myth is based on the fact that bettas can survive in tiny spaces. They can survive, but not thrive. Bettas should have at least five gallons, and a heater and filter. They like the water at 78 degrees Fahrenheit. A lid is ideal to keep them from jumping out, and they need access to the surface because they gulp air.
Good luck with your betta, Ech0o, he is really gorgeous!