i noticed this growing in about 3 spots in my tank in the last week- the other pics didnt turn out too well, but i have a small tuft growing in an area of very high flow, and others in low to moderate areas. It seems to be growing in patches kinda sucks cuz for the last 6 or so months my tank has been doing AWESOME- no algae battles, no losses of any kind . . . About a month ago I started losing my big ole Turban snails- i think i have one left when I started with 6 or 7- I chalked the losses up to starvation since between them, my hermits and other snails they kept the tank pretty clean. Now I have a lil hair algae growing in my overflow and diatoms on my back glass . . and now this stuff- could it be bryopsis? Im blaming the CO2 from my Ca reactor for all this!!!