hey everyone need osme help, i have noticed some whit feather looking spots on the glass, there in some spots. what are these, are they bad for my dish, how do i get ride of these. all my water is ok, 7.0 ph 0 nit and hardes is just right, what could this stuff be, would some alage control stuff get ridew of this. can this stuff cause problems to my fish, ty for any help
