Coraline algae ?

[a123h]

Is this the start of coralline algae . Tank is 8 months old.

 

[EnterName]

A photo under white light would help. Considering the tank age it's very well possible. You can scrape some of it off and put it in some vinegar. It should dissolve and fizz a bit as coralline algae is calcium carbonate to a large extent.

It's also possible you have some other encrusting algae that (strictly speaking) isn't coralline algae (taxinomic order: Corallinales), but something else. The community would still refer to it as coralline as long as it's encrusting

 

[Danroo]

Yup

 

[mcarroll]

Looks like it to me, but like Enter' said, better light would help to be more sure. (But I'm already pretty sure.)

 

[jacree2022]

It’s fine and good till you have to pick it off your frag racks

 

[a123h]

A photo under white light would help. Considering the tank age it's very well possible. You can scrape some of it off and put it in some vinegar. It should dissolve and fizz a bit as coralline algae is calcium carbonate to a large extent.

It's also possible you have some other encrusting algae that (strictly speaking) isn't coralline algae (taxinomic order: Corallinales), but something else. The community would still refer to it as coralline as long as it's encrusting

Here it is under white lighting, doesnt seem as much like coraline now?

 

[a123h]

Looks like it to me, but like Enter' said, better light would help to be more sure. (But I'm already pretty sure.)

 

[get-salty]

I dont think its coralline algae, is it purple ?

Honestly, it is cool and all..
but when you get it all over your display tank esp along the silicon and its hard to scrap them off...

 

[X-37B]

Do not try to scrape it off the silicone. That is the easiest way to damage it. I let it grow over the silicone with no ill effects.
Coralline comes in many colors.
I just took this with a flashlight in my 5 month old growout system.
You can see the different colors and some are the color of your system. I get it my 150 as it grows over the purple too.

 

[a123h]

Do not try to scrape it off the silicone. That is the easiest way to damage it. I let it grow over the silicone with no ill effects.
Coralline comes in many colors.
I just took this with a flashlight in my 5 month old growout system.
You can see the different colors and some are the color of your system. I get it my 150 as it grows over the purple too.

Yeah i would just leave it i dont mind it i want it to occur as people say its a sign of a stable matured tank. This is a picture of it under white light does it still seem like coralline ?

 

[kitti-fish]

Coraline algea should be very pink or purple. You can see the color difference on the back of the tank. Bust best bet it will develop eventually!

 

[X-37B]

Back wall of my 150 after 2 years.
Do you have a fts so we can see the entire system?

 

[EnterName]

Not all coralline algae are pink, purple or red. There are also grey, brown, and green varieties, even though true coralline algae belong to the division of red algae (Rhodophyta).

I have a similar growth on my back wall. I haven't gotten around to taking proper photos yet, but it's a green mat that grows a bit differently than coralline algae. So I believe it's an encrusting algae species that doesn't belong to the order Corallinales, but I lack the taxonomic knowledge about algae to say that with absolute certainty. Either way, the community calls all encrusting algae coralline algae, so you can go with that for now

It's indeed "impossible" to scrape off even with metal blades.