Ya, mine get SUPER stubby if I put them in medium flow.  Mine have very little flow where they are, and little light too.  I can't seem to make them very happy...they have the best PE in the dark when the lights are off!  They tend to retract several times a day too. 
		
	
		
		
		
		
			
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				~ Mindy 
 
SPS fanatic. 
			 
		
		
		
		
	
		
		
	
	
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