It's just too cool looking! Plus the extra couple gallons won't hurt the betta's feelings at all. I've got my betta in a 55 gallon tank, alone! (There's a good story behind that)
I probably should have read the post above mine... Whoops.
ya but im just gonna make one outta some netting with a weight at each end and then drape it over. so far though the betta has made no move to get outta the water.
also did you get your snail in your picture from Rachel? i just ordered one from her and am quite excited