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Copper is definitely doing it. Check ALL of your equipment that sits in water (pumps, heaters especially, etc). Look for damage. Clean out your sump and make sure nothing fell in there.
Test your RO/DI water for copper and your salt mix water. Its gotta be coming from somewhere.
Well, you're right, I shouldn't assume that it is the cause. I was just under the impression that copper is so highly toxic to corals that it must be to blame. I am not sure what level it takes to become deadly though.Why do you conclude that 5 ppb copper is killing the SPS?
I've had copper higher than that when I've tested it myself in the past, and my corals seemed fine.
I wouldn't be sure it is any issue reflected in the Triton results posted.
I would not start chasing copper. My triton result for copper is 14 micro/L but I do feed flake quite heavy.
have you added anything to your tank recently?
there are studies where acro's will die off suddenly with a single new addition with no known cause.