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Bouncing the stream off of the glass is good for breaking up the stream of water, so that it isn't just one direct blast of water hitting the corals, but it doesn't eliminate the need for some type of alternating current device. The glass will break up the stream of water the same way all day as long as the pump is on. So even though your water may seem choppy from the top of your tank, it's a consistent choppiness.
I think that alternating current with some type of wavemaker is still absolutely necessary.
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