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#7
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![]() I would say 6 is the way to go, because if you find it is to much light and get the right fixture with individual switch you can always turn 1 set off. Can't turn and extra set with a 4 bulb if it's not there.
![]() But who am I to say what is right or wrong, I have 8 bulbs per 4' of tank that is 18" deep.
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