The bryopsis just picks off 
  
CUC is clean up crew, as in snails, crabs, etc 
  
I wouldn't raise your magnesium right away. Give your tank time to settle in on it's own and go through some of the initial cycling 
You'll add some critters, then some fish, then worry about the algae 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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