Quote:
Originally Posted by michika
Yes I have had it be an issue. I had a frag/qt tank at one point that I just set up and used after a vinegar cleaning. All the frags died in it for a period of 6 months before I took it down and replaced the silicone. Problem fixed itself. I also did get confirmation after going back to the original owner, that copper, not cuperamine, had been used in the tank.
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Were you able to detect copper with a test kit?