I think a lot depends on what your bio load etc will be and what kind of nano tank you want to keep. I use a skimmer on my sps 24 gal nano but I've stopped using one on my 14 gal nano. I know a few people with nano's that don't use skimmers but do regular water changes instead, and their tanks are very nice.
I haven't heard anything about the oceanic nano skimmer so I can't help you there. Sorry
you might be just fine with regular water changes.
hth
cheers
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