Yellow colour on live rock

[lukefish]

Ive just noticed this yellow colour on the live rock. I’ve checked pictures from when I first got the rock and it wasn’t there before. Any idea what it is?

The camera is enhancing the yellow colour

I’ve had the Fluval evo stock lights (full spectrum0 on for about 12 hours a day then for about 1 to 2 hours of the blue spectrum before bed time.
Maybe this is too much light?

thanks in advance

 

[chrisjj625]

Probably some type of algae. I wouldn’t be concerne.

 

[lukefish]

Probably some type of algae. I wouldn’t be concerne.

Thanks for your reply Chris. I’ll keep an eye on it

 

[Wen]

I would guess yellow sponge, pretty.