Hey so I’ve had my tank running for about a year now . I’ve had a darker purple on my rock for about 4 months and this whole Time I thought it was coralline algae but when I was showing my tank to a friend he said it was cyano, Google and YouTube shows cyano different as it cant be taken off wit a a power head , it comes of if I scratch it HARD with my nail , was going to add chemi clean but idk what it is , should I be worried ? All my coral are still fine or is it something else
Nitrates: 8ppm
Phosphate: 0.12
Nitrates: 8ppm
Phosphate: 0.12