Black algae with use of RowaPhos?

[lastlight]

It wasn't until after I started using Rowa Phos that I decided to read up on Rowa vs. BRS HC GFO. I came across quite a few people that reported increased nuisance algae after starting its use and there were reports of a black algae.

Now this black algae is everywhere and it only appeared after I began using Rowa Phos. I wipe the glass far less often and my phoshphates have gone down but this algae is spreading. Corals are all doing fantastic but soon all my rocks will be black with this white fuzzy layer. I've got the BRS HC on the way and like the others who switched I hope to see this algae fade away too.

Anyone else have it or seen it before?