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Im not sure what you mean by closed manifold, or what benefit you think you get by doing it that way.
Are you doing a manifold along the top of the tank, or are you doing a closed loop with bulheads along the back of your tank?
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180g Reef Tank
900w 20K MH
100g Sump
25g fuge
50g grow out tank
Manifold closed loop
ASM G6 Skimmer
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