I would fill it full of tap water, use a bit of javel water in it and let it soak for a few day with this then rinse it well.  Then I would fill it again with tap water and use Seachem Prime at high dosage to neutralise any residu from the bleach, then rinse it well with a garden hose.  That should do it. 
		
	
		
		
		
		
			
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More fish die from human stupidity than any other disease...
			 
		
		
		
		
	
		
		
	
	
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