Your friend should probably send a sample of his well water to get it scientifically analyzed. It will cost him some $ upfront but it will be better than rolling the dice & hoping the water will work for his fish/corals. When I lived in Powell River, for example, some of the well water had traces of arsenic in it. JMO 
Anthony
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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