Copper in marine tank bad or good

Welcome to R2R!

Not familiar with Hanna Copper Checker but someone on this forum will help you.

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My copper Hanna checker u did twice. Both readings showed 0.11 on the Hanna copper test. Is this good or bad. I mostly have fish that are all healthy and some soft coral. Two frags mushrooms very small. What should I target.
Coral Can tolerate Very little trace of copper- Inverts- NO. If you plan on running a reef with some corals- Add a pouch of Chemipure blue or Lab grade carbon to run into safe level.
Target 0 literally unless tank is Fish Only
If you read package, it should say Do not add to tank with invertebrates and coral
 
My understanding is that copper in a fish only tank is okay as it's treating for any potential outbreaks of fish diseases. I know elevated levels of copper will kill invertebrates - they don't mix well. As for corals as with any metal, too much of it is going to kill your corals. If you're not dosing copper to fight fish infection I would shoot for 0.
 
I assume you treated the tank with copper at some point. If not, you should also determine the source of the copper to prevent future problems. I once had a problem where copper leached from a brass fitting in my sump plumbing. (* I should have known better).

Welcome to R2R!
 
Welcome! I like poly fiber pads and carbon. I've never used Cuprisorb but heard people saying it worked.

 
My copper Hanna checker u did twice. Both readings showed 0.11 on the Hanna copper test. Is this good or bad. I mostly have fish that are all healthy and some soft coral. Two frags mushrooms very small. What should I target.

Welcome! Glad you joined. Post #3 already has best advice so refer you above

Have you considered starting your build thread? I found its a great place to document my tank's evolution for myself. I started tank first then joined, so I'm still finding myself going back collecting pictures & updating historically as well as current state. Once you create your first post in your thread and link it to your account, they will give you build badge (look left, under my ID)

This is a good reference book type online article I still review:
 

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