Hmmmm. Strange because in a reefkeeping article this was said;
"Botryocladia, a red grape algae, grows quickly under intense lighting in this seagrass aquarium. Photo courtesy of Scott Fellman."
And in a reefland article;
"One of the more popular algae species for aesthetic use in refugia is Botryocladia,"red grapes." Although it is a crowd-pleaser for its handsome color and morphology, this algae is not ideal for "working" refugia used for utilitarian purposes like nutrient export, as it is not reliably fast growing or stable over an extended period of time for most aquarists. It is simply and aesthetic delight. photo by Anthony Calfo"