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Copper in display advice needed

Hey guys so I’ve been noticing a lot of my corals specially my hammers have been looking pretty bad tested water everything looks good decided I’ll see my rodi saw my resin got depleted sooner then usual as reading 18 ….
Changed the resin reading 0 now but i thought I’d test for copper and found out i have 0.21 copper level in the main display
How bad do you guys think this is how much is it effecting my system i got cuprisorb and carbon coming in tomorrow I’ll hit it with both
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