What kind of algae really is?

[umutcancamci]

Hello guys,

I have a serious issue with my tank for 2 weeks. It slowly covered rocks and corals one by one and now my tank was fully covered by a brownish maroon slimy thing holding onto its white strings. I thought it was Dino at first but there are no bubbly things on it and it’s sheet-like. I suspect that it’s a bacterial infestation. Could you help me to identify and how can I get rid of it?
View attachment 3391815

 

[Lavey29]

We need clear pics under white light and complete parameters including age of tank and salinity.

 

[umutcancamci]

We need clear pics under white light and complete parameters including age of tank and salinity.

Sorry, I updated the Photos. Age of the tank is nearly 4 months.
Ca:410 Mg:1210 kh:8 NO:3.5 PO: nearly 0 salinity: 35 ppg

 

[Baronen]

Unfortunately looks like Dino’s. Nutrients are low

 

[Spare time]

I'd start feeding more or dose phosphate. I'd also brush/blast and siphon as much of it as you can.