For the past couple days, I've left the light off until it starts to get dark outside, just for the heck of it (the tank's surrounded on 3 sides by windows, so there's plenty of natural light), but now I've got a serious brown algae bloom (the water is a brown-red color), so I won't be doing that again. And for the record, I did a 60% water change on Wednesday afternoon, so it's not a water quality issue.Unless your home all day that's a waste of electricity. Mine are turned on at 5pm and off at 11pm on the weekdays and on the weekends they are on at 3 and off at 11
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Have you checked your water parameters? My current 10 gallon is the only well-lit tank in which I've had brown algae, but it only grows on the side of the tank that is in the shadow of the in-tank filter.Everywhere I have read that brown algae is caused by not enough light, however, I get it on the side of my tank with more light...very strange.