After reading the reviews and searching the internet I finally broke down and bought two of these Led Bubble Rings. And I have to say that I don't regret it for a second. I have now found that they can swim if not properly weighted. So don't just use fine gravel, for more depth, mix in a little fine, medium, and coarse rock up to two inches in size. It will look great. And you can add a valve to the air line so you don't overdo the pressure. I like this model better than the Tetra Led lite because you can get finer gravel in the grooves of the ring and it has better external lugs so you can get your rocks and gravel closer and the power cord is a bit longer when turning on and off Switch. This makes it much easier to turn off the power when it's time to go to bed. Finally, you don't need to buy a crystal centerpiece, it looks great without it, of course this is just my opinion. Thank you everyone for taking the time to read this and have a nice day.
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