This may not help you decide, but with fish you can switch their night/day cycles so the light doesn't bother you. Of course if there's too much ambient light in the room it could be a problem, but if you've got it pretty well shaded back there, you could slowly-- like over the course of a couple of weeks or so-- have them completely nocturnal. My cichlids in the living room don't "wake up" until 11:30AM and don't "go to sleep" until 11:30PM so that I can enjoy them in the evenings before I go to bed. There's ambient light in the mornings, but not much because of the shape of the building and the direction the windows face. (But my bedroom tank is always off by 10PM in case I want to tuck in early.) Good luck with your dilemma.
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