I have some algae that has accumulated somehow on my favia. Dont know how this happens since it is in the right flow, but it did. How can i remove it? A toothbrush would damage the tissue i would think. The algae looks like a brown film, dont think it is detritus but i dont know. Thanks for any help!
![image.jpg image.jpg](https://www.reef2reef.com/data/attachments/3598/3598481-f803bf6d73785747975ceff0a2068b7c.jpg)
![image.jpg image.jpg](https://www.reef2reef.com/data/attachments/3598/3598481-f803bf6d73785747975ceff0a2068b7c.jpg)