Red slime algae or Cyanobacteria?

[IDAN]

I am trying to identify what type of algae I have in my tank and the cause.

It is 150 gallon tank, 30 gallon sump. The tank parameters are
pH: 8.1
Salinity: 1.026
Ammonia: 0
Nitrite: 0
Phosphate: 0.04 (Hanna low phosphate tester)
Nitrate: 5 ppm
kH: 9
Calcium: 400
Magnesium: 1380

I have 2 ice caps gyre 3000 gph at a setting of 70% flow.

pictures:
https://imgur.com/a/uDV3P4D
https://imgur.com/a/uW9s9Cb
https://imgur.com/a/aBT7Lep

 

[PDR]

How old is your tank?

 

[IDAN]

I transfer to bigger tank 3 months ago, used old stuff from my other tank 3 years old and didn't have any cycled problem. (cheeking 2 times a week parameters)

 

[FGourdin]

What is the flow like in the areas you have cyano? My experience is it dwells in areas of low flow.

 

[Dan_P]

I am trying to identify what type of algae I have in my tank and the cause.

It is 150 gallon tank, 30 gallon sump. The tank parameters are
pH: 8.1
Salinity: 1.026
Ammonia: 0
Nitrite: 0
Phosphate: 0.04 (Hanna low phosphate tester)
Nitrate: 5 ppm
kH: 9
Calcium: 400
Magnesium: 1380

I have 2 ice caps gyre 3000 gph at a setting of 70% flow.

pictures:
https://imgur.com/a/uDV3P4D
https://imgur.com/a/uW9s9Cb
https://imgur.com/a/aBT7Lep

Hard to tell from these photos whether it’s an alga or green cyanobacteria

 

[IDAN]

What is the flow like in the areas you have cyano? My experience is it dwells in areas of low flow.

stong+, littel more and I'll have sand storm.