lucavicini
Aquarium Advice Regular
Copper will kill inverts and scaleless fish
You will see here that metrodinazole doesn't contain copper: Metronidazole - Wikipedia, the free encyclopedia
The advantage of metrodinazole, compared to other products targeted to fight ich, is that it attacks anaerobic organisms with very limited impact on fishes.
It is quite common to find metrodinazole in any pharmacy and it is quite inexpensive (a 28 pills box costed me 1.5€ in Spain). It is used to treat certain types of urinary tract and skin infections (from amoebas or protozoa).