Yes you're right, they do seem to be aggresive with other blennies. When I purchased the fish, I explained which fish I currently had in my tank and they said it should be fine...so I took their word for it.  
 
My brother has some blennies in his tank and he's ended up being really good with them...so I am relieved about that. 
 
Sarina 
		
	
		
		
		
		
		
	
		
		
	
	
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