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#1
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2x250w on a 55gal is plenty, unless of course you don't mind paying for the extra 300w of power consumed for the 2x400w.
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#2
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Bleaching is a problem, no question. That is a real reason NOT to go with the brighter bulb. Power, cost, heat, let's not bring that in. What's 'ideal'. Bulb choice is antoher good point. Will corals grow faster with more light though? I mean, yes they will, but does anyone know if they will grow faster under a 400 watt, vs a 250 watt, provided same tank conditions, same spectrum, and same depth (say 8 inches just so there is no confusion!)?
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