Got this for my 45 gallon tank. We manufacture plastic hanger fasteners to size. I had to score the inside rim of my tank where the lid fits in order to install it. I don't like plastic fasteners at all because they seem to break easily. The screws are plastic so they are not 100% immovable, any light touch will move them. NOTE: The flow regulator is located quite high. So you may need to cut the gas cap a bit or drill a small hole in it like I did for the handle. I also put foam under the skimmer to keep it above/level with the water. My fish were constantly ejecting air bubbles from the bottom of the skimmer that keep them afloat. Overall I like it and plan to buy another one for my other tank.
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