Got pics?  Scale of the problem would be good to see.  I understand exactly where you're coming from as I was in the same situation this winter, but I left my tank to a professional maintenance company.  My tank is also in what I consider poor shape, but it sounds much, much milder than your issues.  My first plan of attack while doing a 15% waterchange was to use a turkey baster to blast any detritus off the rocks and use gravel vacuum to clean the sand.  I have a shallow sandbed...you can't just vacuum a deep sandbed out of nowhere like that.  A couple days later I replaced the carbon with fresh stuff.  A couple days after that I replaced the GFO with fresh stuff.  A few days after that the tank was ready for its weekly 10% waterchange where I thoroughly cleaned the sand and rocks again.  My tank perked up in a couple weeks. 
		
	
		
		
		
		
			
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				~ Mindy 
 
SPS fanatic. 
			 
		
		
		
		
	
		
		
	
	
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