I will add a second idea on top of the canopy. There are some aftermarket type shades and diffusers that may work also. I have never tried one out, have only come across them from time to time online. So, just something you may want to research if you would like.
Simple and elegant solution to blinding light spillage from the excellent aquarium light, the Aqua Illumination Prime. This solution is simple light shade to ensure only the downward facing light e…