I found the included legs which rest on the sides of the tank tend to slide and move around frequently, particularly on rimless tanks.  This model allows for you to suspend your Nicrew AquaLux Plants LED light bar form above. 

This has been tested with Model N21861 (12-18 inch model). 

Print 2 of these and slide one on each side of the light. You will need to push it over the LED light mode selector, but it should flex enough to allow this without breaking.