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			 Plexi is fine, just make sure it will be easy to remove for cleaning etc. It will hold in heat in the summer and I agree lighting will be an issue with it. Will also reduce evaporation. Have you priced out a glass cover? Might be cheaper. Egg crate is a good suggestion as well. 
		
	
		
		
		
		
		
	
		
		
	
	
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