ultrasonic sound waves
In a saltwater aquarium? :eek: Why, that's just Stir Crazy, I tell you... ;)
I couldn't get a decent lifespan of those things in freshwater (using tap water) for my fog forest terrariums ... worked awesome -- the orchids loved it, but I thought it was way too frustrating to replace those every 2-3 months at $90 a pop.
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