I can't comment on the Coral Box as I'm not familiar with it at all.
The Bubble Magus is a good skimmer for the price point. What size tank? Off the top of my head I'm not sure what the Curve 7 is rated for, but I wouldn't use the Curve 7 on anything over about 120-150 gallons.
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~ Mindy
SPS fanatic.
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