If you want a schooling behaviour, i suggest adding a few plants into the tank. As for combinations, rummy noses compliment cardinals much better then any other tetras. And since you have shrimps in your tank, maybe you should stick to them. There are plenty of information on the net to tell you how much bioload your tank can hold. Good luck with your cardinals.
Cheers,
Kenny





 
						
					 
			 
					
					



 
				 
				
				
				
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