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					Originally Posted by  Reef Pilot
					 
				 
				Do you ever have to add Mg? 
			
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 Actually, I never have.  I bought  a 3 pump doser specifically for dosing mag as well, and i even bought a box of mag in bulk like 4 year ago (which I just threw out a few weeks ago because it was a solid mass), but when I first set up the tank I noticed that the mag wasn't really dropping.  I was doing weekly or bi-weekly water changes which seemed to keep my mag high enough.  I think in 4 years I've tested mag twice.  The lowest I've ever seen my mag was 1250 I think it was.  When I read up on mag I learned that it mostly affects how Calcium and Alk react and that a difficulty in maintaining those two levels can be a sign of low magnesium.  So, instead of worrying about magnesium directly I just focussed on Calc and Alk and so long as I could maintain those levels I was confident that my mag was OK.  Sure enough, my calc and alk have been easy to maintain and I've had good coral and coraline algae growth.  I don't even think about mag much anymore. 
Another reason why I don't pay too much attention to mag is because I really hate testing for it.  After the second time I tested for Mag I decided that I didn't want to do that again, ever 
