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I have no thoughts on the DSB because I have not ran one in many years but about the metals accumulating in the rock, I know Dr Shimek has been saying this for years and I just don't see it. It is true that metals may accumulate in rock but I doubt to the extent that they would harm anything with the exception of maybe copper. Not copper from the salt or pipes but from adding it to cure ich.
My rock has been in my system for over 30 years and I even had some metal poisonings from outside sources and the corals seem to be just fine.
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