Attention, there are two types of these light poles. One supports only one lantern (good for narrower tanks) and the other supports two lanterns or one further towards the center of the tank. I had to return the one I bought here and buy the XL model in town, but I own two of these and can say I'm very happy with their functionality. Or a 24" wide tank. Get the XL model for anything wider than about 18" (front to back) or your lights will hit the back of the tank and not the center of your tank. The XL also has the ability to hold two different lights and you can even adjust the arm width with two lights so you can reach the top of the 36" tank and get enough light. There are two plastic cubes with double-sided tape for each model, which help you apply these on a rimmed tank, you must not use them on a rimless tank, you can apply them on a rimless acrylic tank to avoid screw marks, they have three light heights to make it higher or closer to the tank In my setup the height is about 5" but may vary depending on the tank configuration. First install the brackets on the flashlight and then put the bracket on and tighten well f est. If your aquarium is wider than about 20 inches, it's probably better to buy two so it keeps the light stable, and you'll probably need two of them if you're using a rimmed tank that has a center support because You don't want to keep the light off center and off balance unless you want to play chicken by accidentally electrocuting the fish. Not because the light falls, but because the brace can tilt if loose. If you're smarter than me, put this on before you fill the tank and you'll have to hang over the water to install it. We only have fun at the cinema in t-shirts. Enjoy!
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