Issues for consideration
Substrate....make sure it's not calcium carbonate
Sand is not a good substrate for plants
If you use sand....plants are best attached to rocks or driftwood
Java moss,java fern and anubias work....note their roots shouldn't be buried in substrate
Dont use plants that aren't truly aquatic....they are cheap but will fall apart
If you choose to change substrate,crypts and amazon sword plants could be used
Melbourne has soft water.....if you want a community.... best fish would be
Betta+ rasboras+ small loaches (not clown loaches) or
Dwarf cichlids(Rams?)+ tetras+ corys(dwarf ones in that size tank)
I'd steer clear of livebearers....mollies,guppies,endlers or platies as they like harder water