coraline dying on glass?

[clayspst]

does anyone know why my coraline is dying on the glass? but every where else it is doing fine. it dies on the glass then grows back and dies again. i dont have any sea urchin's. any ideas?

 

[audio101]

That happened on my old 12g, but it was due to the coralline eating star fish.

 

[clayspst]

i dont have any i think. i have a few astera stars