cmor1701d
Aquarium Advice Addict
Sorry to hear about the puffer 
Copper is very difficult to remove completey. You can try setting it up and using a polyfilter. It claims to remove copper. You can tell by the color it turns.
"Poly Filter turns color when removing medications (Blue with copper, Red with iron, Green with ammonia, etc.). "
I always have one in my sump and replace it every 30 days. Mine always turn brown (good sign).
Copper is very difficult to remove completey. You can try setting it up and using a polyfilter. It claims to remove copper. You can tell by the color it turns.
"Poly Filter turns color when removing medications (Blue with copper, Red with iron, Green with ammonia, etc.). "
I always have one in my sump and replace it every 30 days. Mine always turn brown (good sign).
