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My lighting schedule varies with what I have in the tank. Mine go from 6 to 8 hours the tank that I leave on for 8 has a BTA. Then on the weekends or when I am home from work I leave the lights on a lot longer usually just to sit and watch it the tanks.
Personally I wouldn't do it day after day but once a week on the weekend should be ok. I have noticed when I leave my lights on longer than normal the fish seem to get cranky with one another.