How old is the tank? If it's under a year, then it's just part of the normal cycle and will go away. If that's not the issue, then you need to increase the flow in your tank and do some water changes. Buying more critters is never the solution for algae IMO. If you actually get lucky and what you buy eats the algae, then they starve when it's gone. Most likely though, what you buy that is supposed to feed on the algae, will end up liking what you are feeding everyone else better and not touch the algae. Then all you have done is add even more to your bio load so more algae will grow.
Algae only grows if it has excess nutrients to feed on. Fix the problem, don't put a band-aid on it by getting something to eat it. Also, how old are your lights? I know that when PC lights start getting old they can cause the brown algae. I'm not sure if other lights do the same.