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			 Don, the prism will probably be more thatn enough for a 20g, but think carefully about the future. Will you go bigger in the next year or so? You'll need a bigger skimmer if you do.  
		
	
		
		
		
		
			Also, with a 20g you can probably get by without a skimmer just fine. A 10% water change once a week won't cost too much!! 
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		Brad  | 
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