Ok, very strange, but there is away around it. Have any wiring experience? You could, if you know what you're doing, clip the wire terminals off the light cords and replace them with three prong plugs ~ most hardware stores have the ones which you just
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the striped wire into, then slide the plug up and into place. They also make what are called pigtails, which include a short cord with the plug already attached, and you just cap and twist the stripped ends of the wires together (probably what you would need in order to extend the wires to reach a plug-in; black to black, white to white, bare wire or green to bare wire or green). If you do this be sure and tape over the connection so salt creep doesn't short out your wires. Then each light can be plugged into timers independent of your tank. If you're not comfortable with this you could hire an electrion, but thats usually pretty expensive, and it would definitely be cheaper to run with a night time cycle (course then no lights on the tank on the weekends and days off, which is kind of a bummer)