This link is to a cichlid site, but it's a pretty nice list of active ingredients in medications you can look for to treat various fish diseases. The white spot (ich) looks pretty serious to me, but I am NOT
any kind of an expert on fish diseases in any way, shape, or form. Things I have read about ich say that when the "spots" fall off it will leave open sores on your fish. I tried to look on AU aquarium sites to help you out but I am not familiar with stores there.
I have not had to deal with white spot yet personally, but the high (85oF...29-30oC?) water temp will help the spots on your fish detach. Where medication can kill it in the water since it looks like it is immune to treatment while it is on your fish. I don't know if you can treat both fin rot and ich at the same time if you use meds though.... I just tossed out the link so if you go to a pet store you can look for a medication with the right main ingredient if that is what you decided on doing.
Best wishes, and I hope your poor little guy pulls through
Edited to add the link to the main disease page: http://www.malawicichlidhomepage.com...1.html#disease