Surface area might be a big deal especially if you are putting any fauna in there. I think that bowl lost function for looks so I'd be careful cause you need the gas exchange for your shrimp and plants (if you can even fit them in the opening). as far as the light, From experience (actually yesterday) i realized if it isn't tall enough to cover the top of the bowl then most likely a lot of light will be wasted. That's why I switched to a larger work lamp instead. Hope everything works out.
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