thread algae? Nope... staghorn
 

I "asked Jeeves" and it turns out my algae is staghorn and not thread.
Florida Driftwood's site just kept saying "Flag fish, Flag fish, Flag fish"
for control. I have a pair but the male is a little too territorial for my
community tank. I'm gonna try just putting the female in there. I'll let you
guys know how it turns out!