How about a Brackish tank? I have seen some pretty sweet Brackish Fish around, some puffers and so forth.. 
 
Or how about a Ray? (I think your tank could be a little small) but putting out ideas.. 
 
I think a schooling tank..like Bangaii's, anthias's, or something of the sort. 
 
 
Kris 
		
	
		
		
		
		
		
	
		
		
	
	
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