ultrasonic sound waves

[Delphinus]

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.