What is this growth?

[Madbuster75]

I have this grey green branching growth all over my rocks, glass and inside the filter. It blows of into a cloud of white debris with a squirt of water. This is relatively new and the tank is 9 months old.

In the picture, it’s growing on my temp sensor. Fish and corals seem happy. Because of the growth patterns it seems like more than just detritus.

Thanks

 

[blaxsun]

Some kind of algae maybe?