There are lots of corals that are easier to keep. I'm not sure what is commonly available in Australia, but I would assume that pretty much the same thing would be available there as here in the US since most of our corals come from that general area. Most of the branching and plate forming Montiporas are relatively easy to keep. These are often labeled M. digitata and M. capricornis here in the US, though they may not all actually be these 2 species. Hydnophoras are easy to keep but tend to sting other corals that are placed within 2-3 inches of them. Most of the Euphyllias are easy to keep. Sarcophytons, Sinularias, and Neptheas are all leather corals that do well in captivity. If you want something similar to the Goniopora, Alveoporas, although still a little challenging, are much more hardy than Gonioporas. Galaxias also have a similar look and are really hardy. Many people say Acroporas are for more experienced hobbiests, but they are relatively easy to grow under the right conditions. Most all the mushroom corals and zooanthids are easy to keep as well. This should give you something to start with. There are many more.