I have a 120g with 5 angels, 3 silver dollars, 3 gouramis, 3 buenos aires tetras, 3 hets, 2 knight gobys, some tiger barbs and oh yeah a betta.
I moved my betta from his bowl to the tank and he seems to love it.
I think the saving grace for his happiness is the live pothos plant I have growing out of the back of my tank. He hangs out in the roots most of the time resting. When he is hungry or bored he go's out in the tank.