Thank you guys. I think I've stumbled upon both articles before and am quite familiar with BBA (argh!), but this stuff looked different from all the other types I've battled. It's VERY red - like what we'd call "fire engine" red in the US... which I realized doesn't quite apply here in AU since I've seen yellow fire engines.
Anyways... I seem to be able to sorta keep the algae (the rest, not just the funky spiky red stuff) to a lowish level, but not get rid of it altogether.
Do most of you just deal? Or do some of you have nifty magic tricks and are algae free?