Correct me if I am wrong but most commercial glass blocks u/v which is why you dont get sunburn behind windows. I am looking to block less than commercial like plexi.
I am building a top for my aquarium to slow down evaporation. I need to avoid loosing u/v light from getting to my corals. What product would work best for my application. I have little knowledge on the subject and instead of wasting my time finding wrong information, I would just ask the people...