Like the title says. I installed a light for the chaeto I recently put into my sump but the light shines through the back quite a bit. I am looking for something to slide into the back to block the clear glass on the back. I have found some plastic sheets that seem like they may be a good option (on Amazon) but I'm not sure if they are reef safe. Anyone know of a good option that is reef safe?
Looking at something like this:
Looking at something like this: