For a 120 G and a 40 G sump you may want to consider using the Vertex Omega 150. some reviews talk about impeller problems, but so far after several months of service no problems at all.
http://www.bulkreefsupply.com/vertex...n-skimmer.html
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Hey! I never "LEFT" the hobby, just doing fresh water now. Which is still listed as part of Canreef if I'm not mistaken. 
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