How to get rid of green spots on back of tank.

[Evan28395950]

Not sure what these green spots are, some type of algae. Tried scrubbing it off, didn’t work. Can anyone help me with this? Thanks

 

[DancingShark]

Picture might help. But for tuff stuff a blade works.

 

[dbl]

I moved this over to the algae forum for now. Can you post a picture so we can provide some better assistance.

 

[Evan28395950]

Sorry forgot to add this:

 

[Jackony]

The way those are growing they look like coraline algae? Could that be? If so most of us like the way it helps keep bad hair and other algae off the glass. Hard to be sure from picture.