Companies merge all the time. Generally it's a cooperative joining to enjoy the perks of being a much larger entity and can give their share prices a boost. In this case I think they are both privately owned so it's probably just a way they can stay in business without competing with each other. 
 
Now if Aqua-Illumination would just answer my support request... 
		
	
		
		
		
		
			
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				I have to go out and buy more snails for my hermit crabs.
			 
		
		
		
		
	
		
		
	
	
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