There is simply no need to run 250W of anything on a 29 gallon tank. 10-12 hours of light is average, some folks run less and some more. To a degree, "growth" is overated. If you maintain healthy slow growing corals, your maintenance tasks will be much easier and less time consuming. Too much growth in a 29 gallon tank will become a chore to control over time with regard to competition, supplimintation and biological capacity.
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