i would go and still those bulbs and keep the bettas in 20 gallon aquariums each!!! with lots of swimming room so i can see the smiles on their faces and the bubbles on the waters surface.....
its ok to be a creative artist, but its common sense not to dispose of living animals to show off your work
3 Gallon Betta, 14 Gallon BioCube Planted, 29 Gallon Community, 29 Gallon Parrot Cichlid/Pleco
46 Bowfront Reef Tank, 3 Cats, 1 Choc. Lab