I dont think rid-ich will cure Brooklynella (think I spelled that wrong!). They are two very different things. If I remember there is a dip that needs to be done on the fish. Not sure what treatment is for the tank. There is usually quite a bit of information on the disease forum for this. This disease kills clowns very fast and also spreads fast. Did you post anything on the disease forum? If it was ich in the tank as opposed to the other, then the most effective treatment is copper or hyposalinity. Either of which, you do not want to do in your display tank, you will need a QT.