I bought this to fit a 4 gallon cubic tank. Because it sits so high and my tank is planted I bought a second one to run 2 at the same time. They look good but not the brightest. Whether your aquarium has artificial plants or no plants, a light will work. So here is the design flaw. The tensioning screw is located inside the tank. It has to be outside so the light is further away. On the second bar I drilled a hole the size of a plastic screw. I used an identical metal screw to thread the plastic and then used the plastic screw that came with the light. Now it rests against the back of the glass and tightens on the outside of the tank. Probably their design is good for a rimmed aquarium but not for a rimless one. But for the price I think it's a good lamp.
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