Personally I look on green colour as a plus point, I think the rocks look much more natural with a patina of biofilm. You won't find any submerged rocks in nature that aren't colonised by plants or animals, unless they are continually scoured by sand etc.
It isn't quite the same, but what would the <"Statue of Liberty"> look like if they kept on scraping off the copper oxide so she wasn't green?
I think there’s a few species of algae on those rocks, from a distance it does look like the small tufts you get at the start of BBA but zooming in on the picture really closely -
If this is BBA then it certainly looks like it’s being encapsulated by a dark green Cyano type using it as a good foothold, it’s definitely being avoided as there’s trails all around it but not over it, must taste/smell really bad to the Snails!
I have all shorts of grazing inhabitants from snails to shrimp and hillstream loaches.
It never occurred to me that it has developed due to lack of grazing. Thanks for the insight!
Never have I seen cyano algae in any of my tanks. This one in particular has very high flow although I should mention that the flow had been hugely decreased for around a month prior to fixing it. I have experienced BBA and a protein film so this might account for the appearance of the tufts.
Here are some pictures of the same rock back in December 20th.