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upgrading MH lighting unit for SPS


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I'm planning to upgrade my lighting to keep SPS alive. Currently I have MH Ballast PFO 175 W X 2 with 6 VHO Actinic blue in a 100G tank, 48X24X20, with a canopy. Space is limited under the canopy. What is the best solution for optimal lighting upgrade to 250W X2 or 400W X2 MH and which ballast? Should I increase to 400W X2 or mixed of 250W and 400W. Thanks for any recommendation. I'd like to keep the set up simple due to limited space.

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