Why does coraline algae change color

[minsmarine]

Half of my tank were covered with

I noticed that start from a few day back, they become more on Red side rather than Pink. Anything to worry ?

So far

PH 8.3

NO2 0

NO3 <5

PO4 1

Ca 440

Mg not measured. All are tested with salifest ( wrong spelling ).

[SharkBait]

Are they slimy? Do they trap bubbles? Do they form thick sheets on the sandbed? If so, you have cyanobacteria. Which is not calcareous by any means.

[minsmarine]

Oh they r growning on LR. Some even on the dead SPS frag.

No bubble appear.

Just changing color, so me bit kiasu to ask

My LR r start growing green stuffs ( like grass ) past 2 weeks while coraline algae chaning color to red.

Ok now good or bad, and why , how :0 so many q hah

[Eric]

Oh they r growning on LR. Some even on the dead SPS frag.

No bubble appear.

Just changing color, so me bit kiasu to ask

My LR r start growing green stuffs ( like grass ) past 2 weeks while coraline algae chaning color to red.

Ok now good or bad, and why , how :0 so many q hah

Pic tells a thousand word, show us a pic.

Eric

[boxfish]

Oh they r growning on LR. Some even on the dead SPS frag.

No bubble appear.

Just changing color, so me bit kiasu to ask

My LR r start growing green stuffs ( like grass ) past 2 weeks while coraline algae chaning color to red.

Ok now good or bad, and why , how :0 so many q hah

same here.

has been happening for quite a while...but no hair algae

the red stuff not sure if slimy but like ink on the glass can be clean off

already have coraline "roses" here and there just imagine how quick and fast they coat

[RAV-65]

Those reddish things are cyanobacteria...

[typrobin]

Those reddish things are cyanobacteria...

not really true...i have chilli red coraline algae in my tank...

[RAV-65]

Bro,

they are red, slimy and can be cleaned off leh.... u sure they are coralline algae and not cyano??!?!

[Ekia]

Bro,

they are red, slimy and can be cleaned off leh.... u sure they are coralline algae and not cyano??!?!

what he meant was red algae doesn't mean cyno... could be coralline too.. i have lots of them too still think purple is nicer... haha..

[typrobin]

Bro,

they are red, slimy and can be cleaned off leh.... u sure they are coralline algae and not cyano??!?!

no lah...mine is hard...not slimy kind..

[Gouldian]

no lah...mine is hard...not slimy kind..

Yah loh, read somewhere that coralines comes in different shades, from deep purple (almost black) to pink.

As long as they are hard and encrusting, I would not loose a sweat of it.

[Ekia]

Yah loh, read somewhere that coralines comes in different shades, from deep purple (almost black) to pink.

As long as they are hard and encrusting, I would not loose a sweat of it.

yes i agree.. i got lots of green and red as well.. weird rocks i have

[Gouldian]

what he meant was red algae doesn't mean cyno... could be coralline too.. i have lots of them too still think purple is nicer... haha..

I like those deep purple ones.

Have lots of them now growing. I prefer them to the common purple ones.

Which types you like Bro Ekia?

[Ekia]

I like those deep purple ones.

Have lots of them now growing. I prefer them to the common purple ones.

Which types you like Bro Ekia?

The deep purple ones of course.. need to grow a number of purple coralline layers over each other to achieve deep purple... need lots of time and calcium.. haha....

[minsmarine]

Ok guys, it's what I noticed. After 5 days away from my tank.

Where there is direct light from MH, all gone DEEP RED. I am very sure it's coraline alge cause it's hard , can't get rid of it. And it's change the color from purple.

Where less light, Purple.

Low Low light, pink.

So I would say, depended on light source.

[clownman]

Read somewhere that different coraline algae likes different light intensity.

That means what you're experiencing is normal.

Maybe you can check these out:

http://www.garf.org/coralline.html

http://www.wetwebmedia.com/corlalgfaqs.htm

[minsmarine]

Tks, That's what I think so

[sps_dude]

erm.. if i not wrong.... red coralline algae is due to high magnesium levels... currently my tank also got high levels of magnesium so i have lots of red coralline on my rocks and glass....