04-02-2009, 11:19 PM
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what are your alkalinity and magnesium levels? both are directly related to calcium, and if one or both are out of whack, that could be causing your calcium instability... otherwise you've just got a boat-load of corals in there that are using it up very quickly! (not likely though).
let us know your alkalinity, pH, and magnesium, if you can!
p.s. I'm far from an expert on copper, but from what i've heard once you've added it to the tank, pretty much anything in there is tainted... even the silicon sealant used at the joints of the tank's glass. It soaks in, and is slowly re-released into the water for a long time. Unfortunately (and lets wait for someone else to chime in before taking this advice and running with it), the tank you added copper to may be shot for coral and invert keeping.
It's tough to tell from the first post, but it sounds like this is all for a 50 gallon tank you have (the copper was added to it, it's currently stocked, and it's the tank where you're seeing the calcium instability)? And you have a new 120 gallon tank, that you are thinking about moving some rocks into from the 50? If so, don't transfer anything from the 50 into the 120, until we get more advice about the copper issue... if the stuff in the 50 is tainted, you don't want to put anything (rocks, livestock, equipment, anything) from that tank into the 120, or you risk tainting the 120 as well.