It spins. and back. and Spinning Yes, it will break in about a year. But it's relatively cheap and doesn't have much competition. I've had 4 or 5 of these in 6-8 years. Some of them were covered with coralline algae on the outside, others remained relatively clean. Those covered in coralline algae lasted about 2 years. Relatively clean lasted about a year. Items encrusted with coral were more likely to be soaked in white vinegar than relatively clean ones. Coincidence? Pros:+ Brings movement to the water+ Corals appear livelier due to polyp movement+ Inexpensive Cons:! Breaks after a while. About a year in my experience.! Adds vibration and can cause tanks to hum slightly = need cleaning from time to time. In fact, this is not a minus, but a standard service. Disassemble, soak in white vinegar, clean and rinse. Short story: It turns. It gets the water moving. It breaks down after a while.
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