I battled this plague a couple of years ago, as a matter of fact my tank looked similiar in outbreak as yours. Something is fueling the dino's and they compete for nutrients better than other algea so they fluorish. Massive water changes coupled with turning off the lights for 3-4 days will help considerably. Cover the tank with a blanket so no light enters the tank. Can you add some additional circulation?
I think you are going to have to invest in a better skimmer!
__________________
-=Bryan=-
|