when i first started my saltwater tank back last january the dude at the lfs told me to use purple up, so i did, and i got amazing results with it, a few months ago i stopped using it because it drives your calcium out the roof and i wanted to start having nice coral in my tank.  when i was doseing it i only had some xyena, some gsp, and a colt coral, and they seemed to thrive in the conditions. but then i tried some lps and sps and it didnt do anything.  but my rock is pretty damn purple though. 
so i think it is all personal prefferance if ya want to use it or not.  i stopped using it on my 90g, but i might use it on my cube which is gonna be softies only, 
		
	
		
		
		
		
			
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				4' custom tank all starfire. End overflow 
2 AI sols  
reef keeper lite  
mp40wes 
Diablo skimmer  
Mag 12 return pump also feeding two reactors
			 
		
		
		
		
	
		
		
	
	
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