Capalaba is surrounded by Lakes and country parks, i lived not too far away in Coorparoo for a while, much closer to central Brisbane, and i saw my fair share of snakes and spiders!
I live near a fair bit of bushland (I only live around 35-40 minutes outside of Brisbane's CBD, but there is a bit of land that hasn't been developed yet) and we get a few snakes pop around in summer, but most of them are harmless. We also get a few spiders - Redbacks, Huntsmen, Argiope aurantia's plus a few others. I like snakes, but hate spiders - especially when they are in your room and you go to get them, but they drop behind your bed. When that happens I sleep on the couch, haha