Green Coralline?

[keada714]

Hey folks, wondering if these green patches are consider coralline? They don't brush off and doesn't have a slimy texture. Tank is about 6 month old dealing with small residual Cyano. I don't believe its GHA, as there is two small spot outside of these green patches showing green fuzz that I could easily brush off.

Parameter is as follows:

ALK: 8.3
CAL: 420
Mag: 1305
NO3: under 25
PO4: .05

 

[Baldyreef]

it seems to be normal algae growth on the rocks that are a sign of a healthy reef tank
how long has the tank been set up?
any closer photos?

 

[mmorrison55]

If brushing with a toothbrush removes the coloration, then it’s not coralline. Coralline is hard and usually has to be scraped off.

But I’ve been told that coralline does come in green, so you never know.

 

[keada714]

Tank is 6 month old and it is not brushing off with a firm toothbrush.

 

[Michael Hughes]

If that is green coralline, that's pretty cool! So far I've only had purple and red.

 

[coralcollector98]

really cool! haven't seen this before

 

[keada714]

After further research, i doubt this is green coralline. From what I'm reading, its a precursor before coralline start showing up.

 

[FattyMmatty001]

i have the same thing in my tank, it’s a good indicator that coraline will eventually show itself, green coraline looks a bit diffrent!

 

[blub_blub]

After further research, i doubt this is green coralline. From what I'm reading, its a precursor before coralline start showing up.

Can you elaborate on what the precursor is? I also have hard green algae looking stuff in my tank that is only a few months old. Wondering if it’s a similar situation.

 

[keada714]

Just a indication of the rock maturing and will lead to coralline growth. Upon further examination I'm seeing small spec of purple coralline.

 

[Subsea]

There are at least 5 different coralline algae colors:

Common Colors

• • Pink & Rose: Pastel pink, creamy light pink, fuchsia, hot pink, and magenta are among the most frequently observed natural shades.
  • Purple & Violet: Deep purple, violet, and lavender dominate many marine aquariums and natural rocky shorelines.
  • Red & Burgundy: Rich red, maroon, and dark burgundy strains are common in both intertidal zones and deeper reef crevices. [1, 2, 3, 4, 5, 6, 7, 8]

Less Common & Rare Colors

• • Orange: Certain specialized strains (such as select ARC Reef cultures) display bright or fluorescent orange hues that can phosphoresce under UV or actinic lighting. [1]
  • Yellow & Gold: Specific species produce golden-yellow tones depending on light exposure and depth.[1, 2, 3]
  • Blue & Teal: Rare genetic variations or specific lighting conditions can yield subtle bluish or teal tints. [1, 2, 3]
  • White, Gray, or Gray-Green: Bleached, dying, or mineral-heavy older portions can fade to pale gray, white, or a muted gray-green. (Note: Vibrant green patches on rocks are usually separate green macroalgae or films rather than true green coralline.) [1, 2, 3, 4]

If