DD
"Rambo"
This is unlikely to work. There are standard methods that have proven to consistently work, metro isn't in that list.
It has worked for me every time. It's sort of like the common cold, the goal is to help the fish combat the parasite by boosting it's immune system while preventing secondary infections from the parasite feeding on the host. I won't go as far as say that it completely eradicates the parasite, but it will keep it in proportions small enough that the fish's immune system will combat it. I've never seen a reoccurrence since using it, and haven't had any new fish get infected either.