Some halophiles are colourful microbes like purple sulphur micro organism, the reddy/orange Salinibacter ruber and red-coloured algae named Dunaliella salina. The combination of these microbes, And perhaps some Many others, explains the pink colour in the lake. (If your science behind the pink water at pink Lake Hillier interests you, https://daniels628wxy5.elbloglibre.com/profile