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			 You could try a 'safe for acrylic' plastic razor blade. I got mine from the local fish store for about $7 and it came with two blades and a tool to hold them. Also, there is a guy who makes a device like a Mag-Float but it’s for nano tanks. I don't recall what it is called though. 
		
	
		
		
		
		
		
	
		
		
	
	
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			 nano-mag i think 
		
	
		
		
		
		
		
	
		
		
	
	
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			 for yourself to research but when i had an acrylic tank i used a magic eraser sponge and it worked wonders, again do the research on it before you do as theres mixed reviews plus it also means gettin your hands wet 
		
	
		
		
		
		
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