I'm thinking of getting a background for Levi's hex tank, putting it on the back 3 sides. Here's a pic of him 
		
		
	
	
		
	
Because his head's so dark, I wonder if he'd be lost against black?
This is the tank set up
		
	
What do you think I should go for?

				
			
	Because his head's so dark, I wonder if he'd be lost against black?
This is the tank set up
	What do you think I should go for?

	            
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 There is no substrate other than the sand, but I do use tetra fertiliser. They look OK, but aren't really thriving. No idea on the lighting. It's what came with the tank which isn't really designed for a serious plant grower. It does have a blue tinge to it. How can I tell what sort it is?