I have had a 39 gal. fish w/ live rock tank up and running for about 1 year now.  I am planning on dismantling to change substrate to sand and go to reef setup.  I have a large cannister filter and 9 watt uv sterilizer already.  Do I really need to have a protein skimmer?  Never had one before and have had no problems.  Suggestions.  Thanks. :wink:
								
								
				
			
 
				


