Just my observation, but I started with two yellow cleaners, lost one.  Bout three months later replced it with a pair of visable smaller shrimp, one didnt make it the other bonded with the first shrimp - became new group.  Recently I added two more smaller shrimpa nd other than they set up on the opposite side of the tank.  I havent noticed any ill effects from the first two.  Now I have a cleaning station set up at both ends of the reef and my fire shrimp hang out kindof in the middle.  All 6 shrimp dont seem to bother each other and just do their own thing. Also have a roup of 8 sexy that took over a top corner, but again no problems so far (knocking on wood). 
		
	
		
		
		
		
			
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				My opinions are exactly that - MINE, heed or discard as you will. 
I would be alot nicer if people were smarter.
			 
		
		
		
		
	
		
		
	
	
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