Algae on rocks

[mymarinedream]

Hi
Can anyone advice please.
what’s the cause of this green algae?
NO3 = <2.5
PO4 = 48ppb (0.048ppm)
Ca 425
Mg 1275
dKH 7.1
Ph 8
Salinity 1.025 @ 25.6°c
Aquaforest products as below
Dose Pro bio S & NP Pro.
Use probiotic reef salt
Dose components 1,2,3

 

[Bramzor]

What is your goal? Running Ultra low nutrients? Else you can expect algae and need to counter this which takes time. Pro bio S & NP Pro over time will lower NO3 and PO4 but this will take some time. Have a fish in your tank that eats the algae or what are you doing to prevent algae from taking over?

 

[mymarinedream]

I only starting using pro bio s and NP Pro to reduce nitrates and phosphate. I thought they needed to be 0. Didn't even know what ulns was until people commented on a post saying my nitrates were fine an hour ago. I thought my goals(and anyone else with corals soft or SPS/LPS) were to keep NO3 & PO4 low as possible. Don’t really know now