I just bought a JBJ Picotope 3-gallon tank for a betta after comparing it with Tom Aquatics 3-gallon Deco Kit. The Picotope, being glass, won me over as opposed to the acrylic tank.
However, on reading further, everyone's recommending that a betta tank has to have a cover. Also, I do not want to buy a plexiglass sheet and cover it as it will minimize the Oxygen exchange. I'd like to build a cover that uses a mesh.
What about something like this? I remember reading somewhere about someone using something similar. And no, I couldn't be more vague. Maybe a trip to the local hardware store would yield something similar.