I agree with a copper idea but not from the plumbing. if you run your water for a min or two befor you fill you are not going to get any copper from the pipes. now he has had the rock for 10 years where did he get it from then and has he ever had coraline. if it was from a fish only tank it could have been treated with copper or some lfs might have given him bad info to treat with copper based products for a problem. more history is needed here. the cloramine in the tap water might be a factor also.
Steve
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