Purple Stuff?

[Gavilb]

ive got this purple stuff growing on my plants. does anyone know what it is - whats the cause and how to get rid of it???

thanks

 

[modernhamlet]

Looks like brush algae to me.

Here's a good (but long!) article I found on it: http/fins.actwin.com/aquatic-plants/mont...1/msg00212.html