Urchins?

[littlehermit0]

You got a close up pic of this brown algae you mention?

 

[Garf]

Are the rocks too close to the glass to use a glass scraper?

 

[littlehermit0]

Are the rocks too close to the glass to use a glass scraper?

I don't really want to scrape this, I'll leave it for my other invertebrates or animals for the future, but the algae is cleaned easily without a scraper