Here's the dual monitor mount I used to hang the light.
39.00 at Amazon. I took the two square plate off that mount to the back of the monitor and welded a 1x1x12" bar in its place. the kit already come with 8 plastic spacers and extra loop for the power cable.
Here's how I mounted it in the back of the tank. I modified my existing hanger, welded a cross bar and hang the mount that way. I went this route since I cant get in the back of the tank. if you can... another way is to cut the post and weld the another piece long enough so that you can just bolt it on the stand.