NoPox and red slime cyano

[1979fishgeek]

Been dosing NoPox for almost a year and really happy with the low nutrients but I’m having a issue with red cyano it’s not a huge issue, but I keep getting rid of it with Chemiclean and then a few months later it’s back. Just on a few rocks. It’s in absolutely blasting high flow areas and just annoying me why it keeps returning any ideas?

SG: 1.025
KH: 7.5
Calcium: 445
Magnesium: 1250
Nitrate: 0.2
Phosphate: undetectable

I run a calcium reactor that keeps everything rocksteady and I’m really happy with coral growth, I don’t think my no3 and po4 is as low as it’s reading as I have some macro algae thriving and probably sucking up some of the nutrients. But since dosing NoPox the cyano appeared and just keeps coming back so something is causing it, any ideas?

Photo below.
The rock on the tank floor right of the yellow Tang is the worst area. It’s in crazy high flow as well. Other dark red areas are just coralline algae which happens to be same colour....unfortunately.

Not a major issue...but is annoying my reef ocd, lol

 

[jsker]

I feel your pain

I have dealt with red cyano several times

What kind of lighting are you using?

Mg could come up a bit

What are you feeding. I have been reading with a low nutrient system the amino acids with frozen can cause an issue.

 

[1979fishgeek]

I feel your pain

I have dealt with red cyano several times

What kind of lighting are you using?

Mg could come up a bit

What are you feeding. I have been reading with a low nutrient system the amino acids with frozen can cause an issue.

Funnily enough it’s only growing under metal Halide 12000k but not under LEDs. I have a combination over the tank:

AI sol
150w MH 12000k
AI hydra
165w Chinese black box
150w MH 12000k
AI sol
150w MH 12000k

Food wise:
Algae pellets, mysis, nori for the fish.
AcroPower and Reefroids for coral

So could be a food issue?