IF!

**EQCM2B** · 02-10-2006, 04:53 PM

If it is bright green and IF it is on the glass where there is a good amount of flow and IF it is kind of hard to scrape off, would you think that it is coraline? I have pink, and purple already on the rocks but this stuff is on the glass and does not scrape of very easy.

**davejnz** · 02-10-2006, 05:32 PM

There is a green calcareous/coralline algae.However,I think the green algae that grows on the glass that wont scrape off is something else.I'm not all that familiar with the different scientific names of micro/macroalgaes so maybe someone else can chime in.

**Amphibious** · 02-11-2006, 07:46 AM

It's probably Diatoms.

**EQCM2B** · 02-11-2006, 10:46 AM

All I know is that a razor blade has a hard time scraping it off. Luckily it is a glass tank.

**davejnz** · 02-11-2006, 10:05 PM

I don't believe its Diatoms.They grow as a brownish film that is easily scraped off with a magnet cleaner.This type of algae can only be removed with a razor blade IME.It looks exactly like tiny green algae dots that are left behind after your magnet cleans off the Diatoms.It is not a calcareous algae,I have green coralline algae in my tank and it doesn't grow the same way as coralines do.I believe it to be a type of turf algae.Hopefully one of you algae gurus can chime in here with the proper name for it.