Sorry, I just re-read that and it sounded kind of harsh. All I am getting at is that not everything you mentioned is bad outside of a reef environment. The "dissolving calcium skeletons" for example. Pure freshwater has a pH of 7, a reef tank typically should be at around 8.2-8.4. If not for buffers in the salt mixes, your purified water would also dissolve the corals. As far as copper goes, it is in fact deadly to corals, and to fish in higher concentrations, but with land vertebrates the affect is not the same.

Cheers!

Joe

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