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My tank is set up in a room that has one wall with a sliding glass door on it without any curtains. This door opens up on a covered patio so there isn't any way for sunlight to get directly into the room (i.e. no problem with excessive algae growth), however, there is quite a bit of ambient light in the room. There is enough light in the room to read by without straining your eyes, and of course you can see the fish as well. Now you can see the fish so much better with the florescent light, but most of the day there isn't any one home to view them anyway. So the question is, do the fish prefer a certain amount of light? Should I have the florescent light on 8 hours as normally recommended or is the ambient room light enough and when I actually do want to view them I can turn on the florescent?