One of my fish appears to have an anchor worm and so I have bought some Interpret 12 - Anti Crustacean Parasite treatment. However, it says that it damages p;ants and biological filter media, and I suppose it also kills snails. Does anyone know whether the fish has to be in it for a long time or whether I could put her in a vivarium that I occasionally use floated in the main tank with the treatment in so that I don't have to put it in the main tank? If she only needs a dip for a few hours I think this would be OK but not if it were for days (it also apparently reduces oxygen levels).