long white floating string all over the rock and glass help!!!

[marine]

this morning when i woke up i noticed there are many long white hairy string which look like hair algea but they are white instead of purple or green. I'm shock, so i tried to remove as much as i can by doing water change, but after removing them they appear to be more. Would anyone deal with this stuff before? i have no idea what is it? help!!!. Thanks in advance