My tank is being over ran with red spots.
At first I thought it was good and let it go.
A store pro told me its freshwater coral and it's good. I found no information to support that.
its 2 years later and i want to solve this issue. Good or bad ? What action is required?
New info is it may be red diatom algea
another is cyano
I have attached a picture. Any advice is greatly appreciated and thank you.