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Published on Mar 3, 2008
http://ReefBuilders.com is the source for all your reef aquarium news. This video features the harmonic waves produced by tuning the vortech pumps to the resonant frequency of a tank's 'wavelength'. The first tank is 120cm, featuring a standing wave or 3rd harmonic, using two pumps in antisynch pulse mode. Second tank is 60cm, featuring a long wave or 2nd harmonic, using one pump on pulse mode.