I looked on the FAQ and did a quick search but couldn't find an answer. Do most people use normal screen tops for their corn's vivs? I have seen some mention of covering part of it (or maybe using a glass or plastic top?) to increase humidity/ambient temperature. I have a screen top, should I think about making any modifications? I am using a UTH set at 90F on the glass, ambient temp is 68F and humidity in the room is pretty low: 30-40%.