White thing growing on glass

[heather2244]

There has been a strange white thing growing on my tank glass. Any idea what it is?

 

[Dan_P]

There has been a strange white thing growing on my tank glass. Any idea what it is?

I am not seeing a white thing in this photo.

 

[Sebastiancrab]

Welcome! If it is the white flat area, are you sure you don't have a break in the glass?

 

[heather2244]

I guess in the picture it appears purple - ish but for sure it is white.
No, not a break in the glass.

 

[heather2244]

I am not seeing a white thing in this photo.

It looks purple in the photo but for sure white in person

 

[Nate Chalk]

Corralline, and dying coralline?