Do you have access to Furan 2? If so, I'm thinking Furan 2 and 1 Tbs non-iodized pure salt per gallon in a bare bottom tank with massive water changes - 80% daily - replacing the Furan 2 (not the salt) with each water change. Salt is salt, so don't spend a fortune on aquarium salt. I use solar salt for water softeners and it's less than $5 for 40lbs.
Maybe Al can help further when he see's this post... There are other Aussie's here as well. Maybe they can help point out available meds in your area...
Brian