need help to id white algae

[muddy tdi]

Hy I am new to reef keeping and am worried about this white algae. Can someone please help me out on it cause I have no idea if it is bad! my set up is around 5 months old now. All I have in there is 3 green/blue chromis and 2 young clownfish which are healthy but now it is time to start putting corals in since my parameters where stable for about 2 months now. these are my parameters ;
PH 8 / 8.2 KH 10 NO2 0.5 NO3 15 PO4 0

 

[muddy tdi]

This pic is of my return pump. Please excuse me if this has been somewhere already and I missed it. I am searching alot and cannot find the same white staff! I do not think that this is Diotoms neither!
Any help would be greatly appreciated.
Thanks in advance for your help.

 

[143MPCo]

Almost looks like green slime algae in the first two pictures, the second looks like it not algae but a sponge.

 

[muddy tdi]

May be this pic is more understandable.
Thanks for your reply, if it is sponge is it safe for the future corals?

 

[muddy tdi]

 

[143MPCo]

Yes, sponges in general are a good thing.

 

[143MPCo]

These are in my sump, and my bio-pellet reactor... can you confirm they look the same to what you have?

 

[muddy tdi]

Yes at the surface of the reactor seem to be the same as I have on my rocks. Many thanks for your advice, it is a sigh of reliefe for me so I can look forward for the first corals

 

[muddy tdi]