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 love my rs80 on my reef. used it on a tank just a little bigger than you got, and it pulled out tons of skimmate.  great product...in my opinion over skimming can be bad as well when you have filter feeding invertebrates.. 
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65g/20g reef system, Euro RS-80, 2x tunze 6055, mod 6025, mag7, 250 HQI w/192 actinics,    100 lbs. LR 
46g FOWLR
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