Mustard or Regular Algae?

[LouisMerlin]

I am getting ready to SLAM my pool but I need to know if I just have regular algae or if I have mustard algae.

I am pretty sure I have some black algae next to the skimmer.

I have some persistent light brown/light yellow stains on the stairs and near the drain. They are not pollen as they do not come up when I brush or vacuum. However, they are pretty subtle.

Here is my current pool chemistry:
Free Chlorine 6.5
Combined Chlorine 0
Calcium Hardness 325
Total Alkalinity 100
CYA 60
PH 7.2

Pictures are attached.

 

[pooldv]

I can't tell from the pics but here are a couple of articles from Pool School that should help identify it.

Pool School - Mustard Algae
Pool School - Black Algae