I keep going back and forth on glass tops. I thought it might be interfering with my par levels and was ready to switch to a mesh or egg crate. But when i took my readings my par came out 5-10% higher with them on. Which leads me to believe that if they are clean they don’t interfere even with yhe droplets that collect on the underside. So now I’m wondering is there any benefit to mesh tops. My water evaporates pretty quickly as is and I don’t want the hassle of topping it off even more.