Seeing how fast this plant grows, i would take the methyline blue into thought. by sunday, the stuff is going to spread to the filter and kill the biological bacteria anyways, and it's already killed the bio bacteria in the gravel [img]http://www.**********.com/iB_html312/non-cgi/emoticons/rock.gif[/img]
I have dealt with the dreaded "cyanobacteria" as well..
(also commonly called "blue-green algae")
its the worst!
as other have said, its not really algae, its bacteria..
and the tetra chlorine drops had nothing to do with it..it came in with something you got a fish shop..most likely plants.
IMO the only thing that will sucessfully kill this is Erythromycin.
which can be bought at fish shops as "Maracyn"
(NOT Maracyn 2! they arent the same thing..)
I used it and it worked..you do need to watch ammonia levels, it might harm the biofilter, but shouldnt kill it outright..
here are some articles: