Copper @ 0.50ppm w/ inverts???

reefpatrique

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I thought it would be pretty easy to remove all of the chelated copper from my 40-breeder quarantine tank so that I could use it as a DT when I downsized from my 75g, particularly with Cuprisorb. And it made a pretty big dent at first in the levels which got down to around 0.00 to 0.15 consistently, according to my Hanna checker.

That was about 4 months ago. A week ago they were reading anywhere from 0.50 to 0.80 ppm. After a 95% water change about a week ago, now down to about 0.25 ppm.

Wanna know the funny thing? All this time, I've been keeping two massive tiger pistol shrimp, cerith snails, and various corals. The pistol shrimp are doing their thang, the cerith snails keep breeding, and the corals are growing. A three-headed Duncan has not only had one of its heads recover fully from an random attack by a toby puffer (weirdly, the toby is friends with my corals now), it has grown three new heads. My blastos have grown several new heads. My baby hammer is thriving, GSP continues to encrust, etc. And, I just discovered, my copepod population is expanding.

I believe my Hanna copper instrument is reading accurately since it has consistently taken 0.00 readings from RODI water. API copper test I've had on hand consistently shows a "I'm not sure if there is any there there but I'm not 100% convinced it's clear of copper" reading. On the other hand, poly filter pads have not shown any blue/aqua coloration, just brown.

I've seen posts that inverts and corals tolerate up to 0.10 ppm of copper, but never this high consistently. My thoughts are the chelated nature of it. At this point, though, I'll probably do one or two more 95% water changes and keep the Cuprisorb and ROX carbon in there for the foreseeable future just for kicks and giggles, but I'm not fretting about it anymore.

Has anyone else been able to keep inverts and corals in such consistently, relatively high levels of copper? If so, why do you think it was?
 
From my understanding, the test kit is not accurate enough at low levels and can easily give a false reading.
 
I agree that the Hanna copper device is not really suitable for ensuring low levels. It seems to give false high readings in some (most??; all??) tanks that show no copper by ICP.
 

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