Algae help please

[RRafael]

I am I am having an issue with this and my snail and red legs wont touch it. Iam running GFO and phosphates are 0. What is this and what can I do for it?
Sytem is:

29 bio cube
Leds
HOB skimmer
2x two little fish reactors 1-gfo 1-carbon
Plenty of flow

 

[RRafael]

sorry here are pics of it

 

[Timber77]

Might try hitting it with some concentrated kalk paste.

 

[fit]

How did you measure your phosphates? Can you trust that? What are your nitrates? How old is your tank? Is this a new problem?

 

[dberry28]

Turbo Snails are good solution in my opinion.

 

[RRafael]

I used the API test kit phosphates and nitrates are 0 tank is about 3 months old. I also have 5 turbos and they wont touch this.

 

[fit]

Three months is really short I think. When you get a lot of corals and coraline algae growing, they should start to out-compete the algae. Algae is a natural water purification organism. It will eat nitrates and phosphates. Phosphates and nitrates are bound up in the algae, and nitrogen is released into the atmosphere to help get rid nitrates. If you have algae you have phosphates, no matter what your test kit says. I have a strong suspicion that the API kit is not accurate enough to be meaningful. A large refugium will also help tremendously. However, I do not know anything at all about GFO and its use. Perhaps you are not implementing that well enough.