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Green water....


Kellz

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Hi Kellz

You said you've got 2 x 20W. Strange for a 200l tank. According to the liters, it should be a 4 footer. According to the wattage, they are 2 footer.

Usually 10W per foot. It also depends on the depth. Some books recommend 3 tubes. But you should have at least 2 tubes the length of your tank

John

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