Algea ID and remedy help

[umutcancamci]

Hello, my tank is almost 3 months old and I have softies and LPS in it. Everything was going well until this week. I realized all glow polyps closed and some form of brownish hairy things hanging on rocks. It became more and more tulle-shaped and covered my corals.
I do water changes every week for 10% and give my corals Red Sea Ab+. My light is AI Prime HD has a schedule with 8 hours of full light and 1.5 hours of ramping up and down duration.

Could you please help me identify this thing and give me a suggestion to get rid of it?


Ca:410 Mg:1210 kH:8 NO3:5 PO4:0

 

[therootcause]

It looks like dinoflagellates. Do you notice that this brown slime disappears overnight after lights are off and returns by the end of the daily light cycle?

I would consider adding live phytoplankton and copepods. Syphon out what you can and add filter floss and swap it out each day as it becomes accumulated with the brown slime.

 

[EeyoreIsMySpiritAnimal]

It looks like dinoflagellates. Do you notice that this brown slime disappears overnight after lights are off and returns by the end of the daily light cycle?

I would consider adding live phytoplankton and copepods. Syphon out what you can and add filter floss and swap it out each day as it becomes accumulated with the brown slime.

^^ This. And increase your phosphates