Due to a naturally high salt concentration and recent weather conditions the three lakes in Port Melbourne's Westgate Park have turned a shade of lipstick pink.
The phenomena is caused by a natural interaction of a harmless, single-cell alga and halo bacterium, increased in the hot weather. It only occurs in saltwater lakes in a handful of countries around the world. There are also some pink lakes in the Murray-Sunset National Park in north-west Victoria.
They are visible from the Westgate Bridge but I drove there today to get a better look