Take your hood to a glass shop and have them use it as a template to make you a glass lid. I currently have a piece of glass that I cut myself as a lid and am in the process of getting one cut by a glass shop so it fits exactly with a feeding door. If you have it cover just the DT and leave the back chamber open, you don’t have to worry about gas exchange, and it keeps evaporation down to just barely more than with the hood. You also don’t lose much light, maybe 1-2%. If you have pets (cats or parrots) a glass lid is far preferable to a mesh lid.At first I wasn't so sure if it was worth the upgrade tbh. But after a few weeks I've slowly come to realize what a difference it actually makes however evaporations has increased exponentially which is to be expected... a 2 gal jug with the tunze ato fixed that.