Dino or Cyano

[Bling4Drift]

I dont know, what it is and how remove it. Cleaned rocks every day. But it comes back.
Tank 40 gal 9 month old.
Temp 24
Salnity 1.025
Ph 8.04
Kh 6.1
Nitrates 20 ppm
Phospate 0 ppm
Lamp is on for 8h a day
Feeding 1x a day with flakes and 1x or 2x a week feeding with frozen food

 

[vetteguy53081]

I dont know, what it is and how remove it. Cleaned rocks every day. But it comes back.
Tank 40 gal 9 month old.
Temp 24
Salnity 1.025
Ph 8.04
Kh 6.1
Nitrates 20 ppm
Phospate 0 ppm
Lamp is on for 8h a day
Feeding 1x a day with flakes and 1x or 2x a week feeding with frozen food

Pic a little dim and blurry but may be staining versus cyano. Try blowing off with a turkey baster and it likely will not dislodge

 

[Bling4Drift]

Pic a little dim and blurry but may be staining versus cyano. Try blowing off with a turkey baster and it likely will not dislodge

It not comming with toothbrush. Very hard comming off. With turkey baster not comming off

 

[Bling4Drift]

Maybe bether picture.

 

[vetteguy53081]

Maybe bether picture.

Looks like a type of coralline known as burgany coralline causing stain effect and can be chipped off with ice pick but desired by many for its color