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Instead of only one row of lighting like most tanks, my diy setup has 3 rows. One in front one middle and one towards the back, this way i get more wattage and focus it over the whole tank not just in the middle
You'll either have to get another light fixture or retrofit the one you've got. You can't simply upgrade the wattage in a fluorescent fixture like you can with an incandescent fixture. Look at the Marineland Double Bright LED fixtures.