That's weird, here's the whole bit.... 
 
I made a plexiglass lid for my tank and it was a nightmare. The heat from the tank and the lights (I was running LEDs at the time so not much heat) made the plexiglass bow, and I picked fairly thick plexi.  I even reinforced the middle by doubling up a strip and it still didn't help. 
 
The condensation on the underside of the plexiglass looked awful and it made the pH of the tank plummet instantly. 
 
The moment I took the lid off the plexiglass rapidly climbed back to normal. 
 
The idea was born and killed within 48 hours. 
 
 
 
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