Destroyer - It's not that bad... yet. Problem is how fast the spirogyra algae can rebound. I'm going to wait and see what happens, but I worry that it'll take over the tank within a week or two. I don't mind a few algae spots, that's normal for a planted tank, but I don't want the 'scape to be nothing but algae.
Python - I'll give that a try. So far I've squirted Excel directly on the algae, but H2O2 sounds like it might work better. The hard part is the HC: most of the algae patches are wound around low-lying stems of HC. Worth a shot, though!