I checked for Hex-a-mit. The only Australian websites that come up on
the search just tell you to use it, there's no sites to purchase it.

I figured the vet would have it - I really love this fish, but I
honestly didn't think vets looked at fish... I thought fish were one of
those animals where the vet would laugh and say "meh, just flush
it!"...

Has anyone here taken a fish to the vet???