You have a GT and Festae already and want to add a couple more to a 200g tank, correct? If so, you have many options... Argentea, Bocourti, Synspillum, Midas, Pearsei, Cuban, Loiselle, Lyonsi, Amarillo... not sure what you can get down in Australia tho. I don't see why you cannot choose two of any of these to be honest... a Pearsei and Lyonsi would look nice with the two you already have, imo.