An interesting link, particularly since these devices obviously exist.

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I could certainly go one. They say it's ok to have fish, but this description from the smallest SSS model makes you wonder:

LGSonic wrote:

The method of algae killing is like the other devices by ultrasonic for humans and animals inaudible underwater sound waves, which cause vibrations ripping the algae vacuoles, micro cells in which the life functions are housed, thus killing the algae.

not very good for plec keepers no algae plus not sure that it would be harmless on all fish

I'm fairly certain that I won't rid my tank of Algae through chemical means, unless I remove all of my fish. I've been thinking about one of those ultra-vialet units that you pump through.