The silicone seals in your tank are going to soak up that copper (if there is any) and leach it back into your tank over time...
I've had really good luck with vitiman C tablets, garlic, and this
http://www.marinedepot.com/ps_ViewItem~SearchStr~Vitamin C~action~view~idProduct~KM3293~idCategory~FIADTECS ~category~Kent_Marine_Zoe_Marine_Vitamin_8_oz._Sal twater_Aquarium_Supplies_Additives_Trace_Elements_ Vitamin_Coral_Supplements~vendor~.html
Ich isn't the end of the world like most people think it is. If your fish are healthy then they should be able to fight it off like a common cold...