There are a lot of air bubbles and even some wood chips in the silicone joints of the custom aquarium that Concept built for me. It has now been running for 2 years and holds water just fine so far. But the build quality was a little lacking. The other two tanks of theirs that friends of mine purchased are similar. 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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