hello everyone,,,,im looking for a refergium or a sump tank,,,,can somone explain the differences  to me ,,,,i have a 72 bow ,,and am currently running only a canister filter ,,,im looking for a refergium or a sump,,,,looks like im going to have a custom one made.  but i dont how big i should go. thank you in advance 
p.s my tank is not drilled
								
								
				
			p.s my tank is not drilled

 
				

 
 
		 
 
		 
			
		
	
	
		 
			
		
	
	
		 
			
		
	
	
		 
			
		
	
	
		 
 
		 
 
		 
			
		
	
	
		
