My fish go crazy for this stuff.  Its like crack for fish I find!  Just takes them time to get used to it.  Try feeding the algae waffers right next to the suction cup and see if they take a bite of it.  I have an orange shoulder that took a few days to warm up to it, but now the second I put it in I can't even get my hands away before he is trying to eat it between my fingers! 
		
	
		
		
		
		
		
	
		
		
	
	
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