Biggest problem with shrimps (pepermint/cleaners) are that they are great snacks for larger fish. (I saw antenna sticking out of my dwarf lions mouth a few times). 
 
But when they are larger and heathy they can hold their orn a bit better. 
 
One of the most common problems is that they are very susceptible to acclimation to new water (via shipment or transport).  I lost 6 cleaners a few months back in my personal tank due to them dying off because of this.  That is why I now ONLY acclimate shrimp with a drip method for no less than 2 hours. 
 
Mortality rate is much better due to this. 
 
Ken - BWA 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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