Actually the aussies are not more hardy... its just that they have a different collection/supply chain than the indos. The problem it not the coral themselves, but an infection/disease that is spread by housing the sick with the healthy.
Borneman did an article on all that and looked into the common perception that it was the area they were collected or the depth etc... and the only real common factor was housing/shipping locations.
The aussies are much more colorful though and come with different colored tips/bodies etc so they are more desired. Add to that they come from a collection point that hasn't been infected and they are doubly appealing. If you buy one, make sure you ask the supplier if they were housed with Indo species. If they have been, I would pass and move onto a supplier that has only housed aussie varieties. I believe Zoanuts is one of those....
I've got an aussie in my system, a pink tipped one that is very pretty. Has a taste for sea hare though
Keep an eye on Divers Den as well, I have seen some fantastic looking ones there, blue/purple with pink tips etc.
I've had one for about 6 months now, and so far so good, usually the first 6 months are when you loose them. Check back with me in a year, and I'll let you know how hardy it really is.
