IF you live on any canal there's usually a sandfly/midge problem for a short time in summer - I live in a unit block (on the 4th fl) on a canal and only let a couple of sandflys per year so no hassles
Hi I lived in Bbeach Wts for 13 yrs on a canal yes midgees (Sand flies) are a prob at dawn and just before dusk mostly. My sister lives in Sorrento/Bundall and she isn’t on a canal and midges are a problem there too.
We have lived in BW for 3 years and YES - you need Aerogard Tropical at every exit of the house - and need to spray even when hanging out the washing except for windy days. However, the beauty of living on the canals is the best so it is only a little problem.
No offence, but if you can afford a water front property in Broadbeach I don't think sandflies would be your main concern. They are such polar extremes you may as well be in the Artic .