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I have a 29 and the same fixture. If you mount it to the tank it is very high light with both bulbs on. I've been using it with just one light on for a while now and it seems to be doing ok with Excel instead of CO2 and Flourish only, but my plants definitely show signs of nutrient deficiencies. If you want to use the fixture and stay lower light for now but go to high light later, your best bet is to hang it above the tank so you can lower it later for higher light.
 
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