Sorry i dont know what treatments are available in NZ but if you haven't already then turn the heat up to 30dgc and add aquarium salt at a dose of one teaspoon per 5 gallons,a good local fish shop will be able to tell you which medication to use.
As mentioned before rams are a very sensitive fish and very few last long ,they were one of the first fish we had when we first started fish keeping but after a few attempts at keeping them decided to leave them as not one lived any longer than 6 months.I think that if you really want to keep these fish it would be best done in a largish (at least 30g) species tank with just rams and a lot of attention paid to getting the water conditions perfect for them.
As mentioned before rams are a very sensitive fish and very few last long ,they were one of the first fish we had when we first started fish keeping but after a few attempts at keeping them decided to leave them as not one lived any longer than 6 months.I think that if you really want to keep these fish it would be best done in a largish (at least 30g) species tank with just rams and a lot of attention paid to getting the water conditions perfect for them.