I used to maintain some cold water tanks at the local college. Some really interesting things in there. I understand you need a fishing license for lots of the stuff, and special permits for others.  
You'd need an acrylic tank for it's thermal properties,and a really good chiller. 
		
	
		
		
		
		
			
				__________________ 
				Brad
			 
		
		
		
		
	
		
		
	
	
	 |