What has caused this

[PeterEde]

This tank is now 2 years old. Ive struggled with nitrate for ages but never had algae like this.
My nitrates have been as high as 60ppm but for 6 months plus have managed to get it to around 20ppm
Phosphate is at .04.
I am dosing 16ml of ethanol daily.
I feed once a day.
Tank does get afternoon sun.
Fish are all healthy
Notice gsp has been pretty closed up for sometime

 

[Saltyreef]

I had persistant algae like that. Dosing pods and phyto really helped along with manual removal during water changes.

 

[Baldyreef]

I had persistant algae like that. Dosing pods and phyto really helped along with manual removal during water changes.

Same here I had a really bad hair algae outbreak that would keep coming back and only got rid of it until I added pods and did a ton of manual removal