i would and do myself change the foam insert every 6 months or so. I do water changes on my fresh water tanks once a week  and  do not use carbon unless I have fry and have never had a problem. Running carbon all the time is a waste of $$ ( i think) . I would run foam and Bio max, and do weekly water changes and you will be good. 
 
good luck 
		
	
		
		
		
		
			
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