what do i have here? im guessing O. Mercatoris.
Dear Denise,
There is no copper in the product. Below is the answer regarding the cautionary statement:
We advice to be careful with invertebrate because if the material is not properly rinsed before being used, or not properly installed into the filter it can produce, in some case, very fines particles. These particles will be harmless for fish and larger invertebrates but can act like small piece of glass onto the invertebrate delicate mouth and gastro intestinal tract.
That being said Clear-Max will absorb phosphate and other pollutants. If the main problem with the tank is phosphate accumulation we have Fluval Phosphate Remover that will do a much better job at it (it is it only function).
I hope this information is of assistance to you.
Noralynn Naughton, Customer Service