Orange/red algae

[TheGreatBarrioReef]

Added 2 chunks of dry real reef rock to my established tank and a week later i got this orange/red algae on my sump mostly only growing on the vinyl hoses. Hasnt grown in the display tank.

 

[Doctorgori]

Weird ...my hoses look like that with poorly rinsed GFO

 

[TheGreatBarrioReef]

Weird ...my hoses look like that with poorly rinsed GFO

At first i thought it was that but i can see chunks of algae move with the current inside the hoses and when i turn off and on again pieces start flying out the tubing.