A very experienced person told me that with any new batch of carbon, it should be immerged in boiling water then left overnight in a small container, then in the morning the water should be tested for copper.
If only I had knew about this possibility I would have done this. Then only if the copper test is negative one can use it in the aquarium.
I am going to do this from now on when ever I wish to use carbon. I am only going to use Seachem Matrix carbon from now on and I will test it.
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More fish die from human stupidity than any other disease...
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