There is some white fuzz-like film covering my rocks (yellow areas in the picture).
It's honestly difficult to see in pictures, it simply makes the rocks appear lighter in colour.
If I brush the film off the rocks, it comes off as tiny white hairs floating in the water.
This film seems to grow into larger fibre/filaments in certain spots (red areas in the picture).
Anybody knows what it could be? Can/should I do something about it?
Thanks a lot!