If the fish are small, I have used two 5 gal pails. (20 liters) 
Again, it depends on the size of fish. You would not put a 4" tang into a 5 gal pail. 
On the last day in the "tank" I feed a lot, and before bedtime, I put a black plastic bag over the tank. Then in the morning when its still dark in the tank I transfer. 
		
	
		
		
		
		
		
	
		
		
	
	
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