Algae on rocks (hairy looking stuff): Don't worry, your cleanup hermits will love it. Brown film on glass: Your cleanup snails will take care of it, but won't be nearly as efficient. Get a magnet or a scraper, and get some exercise scraping it off the walls. You'll need it anyway after Part II arrives.
Macroalgae growing on rocks: Good stuff, your tang (presuming you intend to get a tang) will love it and eat it all in 2 weeks...
Hermits can't climb walls, so if you've got hairy stuff growing on the walls, scrape it off & let it get sucked either into a sponge or overflow where you can fish it out & dump it.