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How much lighting would my tank need for Anacharis in wattage if I have a 40 gallon tall tank about 20 inches deep. I use 18 inch light bulbs. Also this might sound like a stupid question but how is wattage calculated, if I have two light bulbs of 15 watts does it combine and equal 30 watts? Sorry for the corny questions but I am just getting started and cannot find this info on wattage for my tank specs on the forum!