I would personally go with 3 lights. I would also go with 400w on all 3 as well, but that could just me. Always think more is better.With only 2 400 you are getting about 3.8 watts per gallon and that is not alot. You are also not getting full coverage accross the area of your tank. A good 'rule of thumb' is a light for every 2' of tank width. Just my 2 cents worth. Good luck.



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