How to remove this algae from the glass????

[David Cher]

I tried with d d mag float and tunze glass cleaner tdoes not move at all

Please advice to remove it

 

[sde1500]

Get a scraper, one with a blade. Or an old credit card.

 

[BlueCursor]

+1 on sde1500's comment, assuming that is a glass aquarium. If it is plexi, go with plastic scrapper only.

 

[norfolkgarden]

Our aquarium is glass and I use a brand new safety razor every time. It goes much faster with a new blade.
I'm lazy so I only do it about once every 3 weeks and it really is ready by then.

 

[norfolkgarden]

You are talking about purple coralline algae right?

 

[Lusanity12]

I have a flipper mag. Has blade on one side works awsome for stubborn stuff. Even scrapes off coralline off glass.