I get the feeling this ain't GOOD algae

[andsoitgoes]

It's now covering a large portion of the rock - Great shroom on it and some anthelia - I can move 'em and clean the rock, but I'd rather not have to.

Is this something I need to worry about? It LOOKS like BGA, but I don't want to kill something good without knowing (already turfed my share of good worms )

Thanks in advance!

Nick