I have this Orange film that is growing on my sand. I also get film algae on my walls that I brush or scrape off, is this the film algae just on the sand, or is it the circled coral spreading?
if it helps, the Orange disappears at night when the lights go off then becomes brighter and more Orange in the mornings as it gets more light
if it helps, the Orange disappears at night when the lights go off then becomes brighter and more Orange in the mornings as it gets more light