Algae outbreak!! Need help to ID and fight.

[ASIN28]

Hey all,
So my 120g tank has been up and running for 6 months now and over the past few days started to see this algae and suctioned it out but now it’s getting completely out of control.
Water parameters:
Ammonia 0
Nitrite 0
Nitrate 35-40 (Ik high)
Phosphate .08-.1
Alk 8.2

Lighting: Reef breeders photon v2 with 8 hour peak lighting schedule.

What type of Algae is this, and how do I go about controlling it? Been doing weekly 20% water changes to try and drop nitrates not working gonna have to do a bigger water change.

 

[ArtofReefing]

Not 100% sure but it looks like dinoflagellates. If it indeed is then you can use a product called dino X or you can put a uv sterilizer in your sump or rear chambers and run it for 24hrs for a week or two. This will also clear up the dinos and keep them at Bay.

 

[ASIN28]

Still have this algae outbreak not as bad been suctioning it out every day but it comes back a few hours later...