What is this algae

[Camcrick18]

Tank 70litre
1 yellow coris
1 Royal gramma
1 watchmen gobi

Been up 2 and a half months.

Tested water with red sea test kits.
Ammonia 0
Nitrite 0
Nitrate 5
Phosphate 0.075 ish
Alka:8.6

Any ideas on what this algae is. Had it for about 2 weeks now

 

[Retro Reefer]

Can you provide a picture with white light only?

 

[Camcrick18]