To quote someone else.
"To answer your specific question, salt creep is the salt deposit that is left behind after water evaporates. Running water always causes a little bit of a splash. Those splashes turn into a really fine mist which clings to surfaces near the source. It dries, salt gets left behind and the process continues. As the salt crystals 'grow' the white flake like stuff "creeps" around on your tank.
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