It really depends on your overall setup.
Skimmers only remove a small percentage of doc's, so if you have a substrate or coral overgrowth, detritus can build up, so a better solution may be to make sure that you have good water circulation and a clean substrate instead of getting a bigger skimmer.
Good water circulation will allow bacteria to digest DOC.
Thinning out coral growth will allow better water circulation.
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Mitch
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