Help identifying strange algae

[Baldy]

I have been running gfo ever since i took biopellets off my system, and just started using chaeto in my sump and Its growing pretty darn quick as well. I have been debating trying prodibio, but ive done a lot of changes to the tank lately with new additions and stuff so im gonna give it a couple months before i pull the trigger on anything that big like that. Strangely enough, ive never seen a sign of nitrates yet since removing the biopellets. Im pretty adamant about 15% water changes every 2 weeks, and the bioload is pretty light, so maybe thats why.

Its good to know that im not the only one with this as well. maybe running longer photoperiods might be the answer?