Mustard Algae - SLAM?

[Jmg_moocows]

Although, I maintain my FC #'s and do not have CC > 0.5 ppm, we didn't use the pool for 2 weeks and found mustard algae (I think) on the steps/wall by jacuzzi. I removed the bubble cover, brushed the entire pool...it hasn't come back. I was planning on doing a SLAM, but I pass the 3 criteria so I have a couple of questions:

Timeline:
Aug 27 algae found on steps and partial wall near steps; remove bubble cover brush, vacuum everywhere
Aug 28 @ 8:30pm FC = 6.8, CC = 0.5; No algae re-appearance
Aug 29 @ 8:30am FC = 6.6, CC = 0; No algae re-appearance, pool is clear, OCLT passes, CC below 1
Aug 30 - Sep 3 Maintain normal #'s, still concerned but no algae has re-appeared; average Chlorine usage is 1 ppm during this time
Sep 3 @ 9:15pm FC = 6.5, CC = 0
Sep 4 @ 7:45am FC = 6.5, CC = 0, OCLT passes again, pool remains crystal clear, was never cloudy (see pics)

Current #'s
FC = 6.5
CC = 0
pH = 7.5
TA = 70
CH = 650
CYA = 40
CSI = 0.10 (water temp averages 85 deg so I keep pH lower than ideal)

1) Should I do a SLAM?
2) If so, do I go straight to MUSTARD SLAM since I already pass all 3 criteria for SLAM?

 

[red-beard]

Is this at the bottom in the middle? MA forms in dark, shaded areas. Might be pollen or debris in the pool.

 

[Jmg_moocows]

Is this at the bottom in the middle? MA forms in dark, shaded areas. Might be pollen or debris in the pool.

It was on the steps and side wall near steps, when brushed it poofed up

 

[red-beard]

Is this a heavily shaded area?

 

[Jmg_moocows]

Is this a heavily shaded area?

Not at all

 

[red-beard]

I am skeptical it is mustard algae

 

[Jmg_moocows]

If it comes back, I'll snap a picture of it on the steps... So far, everything looks good without SLAM being done