Fluorescence coralline algae?

[kilnakorr]

My tank is about 10 months old, and so far I got a nice purple and deep red corraline algae growing.
However, I just noticed this on a snail shell.
I looks very much like corraline algae, but it is bright flourescence (spell check?) orange:

Any idea what it is, if not corraline?

 

[N.Sreefer]

Dying coralline algae can glow like that. It may white out after fluorescing for a bit. I would check alk and cal just to make sure they're good but this often happens as the tank reaches different stages of maturity some algae's will die off or be outcompeted.

 

[Joe31415]

Dying coralline algae can glow like that. It may white out after fluorescing for a bit. I would check alk and cal just to make sure they're good but this often happens as the tank reaches different stages of maturity some algae's will die off or be outcompeted.

Unrelated, but my (almost a year old) tank had a sudden algae die off. Nothing horrible, just odd. All the specs and splotches of corraline still look like they always have, but a few days ago all of one of the types of algae turned brown.
I'm assuming it was just an abrupt change from one ugly stage to the next or I'm finally finishing up with the ugly part.
Nothing in my parameters looked all that much different than it has, so I guess that's good.

 

[Gtinnel]

Dying coralline algae can glow like that. It may white out after fluorescing for a bit. I would check alk and cal just to make sure they're good but this often happens as the tank reaches different stages of maturity some algae's will die off or be outcompeted.

This. Dying coralline algea can flouresce a beautiful orange under blue lights ecspecially, before it dies

 

[kilnakorr]

Dying coralline algae can glow like that. It may white out after fluorescing for a bit. I would check alk and cal just to make sure they're good but this often happens as the tank reaches different stages of maturity some algae's will die off or be outcompeted.

Ahh.
As you can see in the picture, there are some algae on the back and alot of it is dead, from the first few patches.
It is quite possible the algae acts differently depending on what it was exposed to.
The snail could very well have taking a nap at the waterline, with the shell exposed to the air.
To bad it goes away, as it does look cool.