Help my get rid this algae

[Tarlon]

Hello, please I need help. I got tired of fighting some kind of algae in my tank, it has been there since October of last year. IIt decreases every time the lights go out and does not have bubbles like the dino. I have kept all the main parameters stable. I have done biweekly water changes again since 3 months ago, I add matrix carbon and rowa.
Does anyone have any idea what it is?

 

[Tarlon]

The rest of the tank looks good only the sand which has this problem

 

[Tarlon]

Hello, I finally got my microscope today. Unfortunately it is bacteria that is on the substrate, only I do not see any flagellum to identify it as a dino. The other strange thing is my parameters, especially phosphate, which today is at .06 and my snails are happy. Please could you help me to identify it in the video?

Youtube Video

 

[Tarlon]

a pic:

 

[Dan_P]

a pic:

@taricha any thoughts?

 

[homer1475]

Pic of the sandbed looks like cyano, but the microscope pic looks like dino's.

 

[Ta2oodfreak]

Looks like dinos to me because of the "roomba" like movement.
Looking at your tank I'm not sure how I would approach that with the corals you have..... I beat mine doing a blackout, H202 dosing, bacteria dosing and then slowly ramping up the lights.

 

[Tarlon]

Thank you very much for your answers, I will treat my tank as if they were dino. doing a search through the forum I think my problem is with amphidinium dinoflagellate. What do you think?

 

[Tarlon]

Today I found this monster in my sump, appear to eat dinos.
Its stomach is full with dinos food