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depending on surface flow, yes. If you've got a lot of surface disruption, it will get "stirred" back into the water; if you haven't much, you'll be able to see protein build up. I have a koralia nano pointed at the surface of my tank, it's increased the productivity of my skimmer quite a bit.
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-Jeremy
"Quidquid latine dictum sit, altum viditur"
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