If you are dead-set keen on getting some Magnificents, I would get hold of some GTF from the NT or northern Qld that will expect a similar temperature range. While the Sydney GTF will tolerate higher temperatures it really is not geared to them year round. It is naturally geared to a Sydney winter and just won’t thrive as well under the continuously higher temperatures. There is a difference between thriving and surviving. Peron’s would be an excellent choice for a Sydney GTF, especially given the contrast in appearance, where each would tend to highlight the other. They are an interesting and active frog, more so that the GTF. Just get them at roughly equivalent sizes and go for it!
Blue