The Tetronic extension arms can be used to attach Tetronic lights in sizes 380, 580, 780 and 980 lengthways or sideways to almost all aquariums without a lid. The installation is really simple, via screw fastenings, and you don’t even need any tools. As one option, the lights can be inserted lengthways into the Tetronic extension arms. In this case, the arms are installed on the side panes and the extension arms of the lights are simply inserted into the designated slots. Alternatively, the arms can be slotted sideways into the aluminium ridges of the light. That way, the light can be suspended parallel to the back of the aquarium. Depending on the size of the light, one or more arms can be used to provide sturdy support.