Weird brown algae growing on my corals?

[SolarReefer]

Hello! I have this weird brown algae growing on some of my corals. It looks like it could either be dinos or brown hair algae but it only grows on a few of my corals plugs and only a couple spots on my rockwork. The tank is about 5 months old. I run a protein skimmer just did a 20% water change today. Phosphate tested .04 today and nitrate tested well above the measurable scale on my Red Sea test kit. Whatever this algae is looks like it’s killing my candy cane coral.

 

[exnisstech]

Most corals look like they are dead or dying. Algae doesn't grow on live coral tissue to my knowledge

 

[SolarReefer]

More pics

 

[wtdenk]

Hard to be sure without microscope pics, but it looks like dinos to me. Do they receed at night? Do they blow easily with a turkey baster?

 

[SolarReefer]

Hard to be sure without microscope pics, but it looks like dinos to me. Do they receed at night? Do they blow easily with a turkey baster?

They don’t recede or blow away with a Turkey baster