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					Originally Posted by  sphelps
					 
				 
				You could use eggcrate to hold cheato in place. Didn't notice you were using an old vertex, maybe try it out at a few different heights and see if the bubbles stay in the skimmer. 
			
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 What about water level change due to evaporation (although I will have an ATO)? Wouldn't that effect the performance of the skimmer?