I'll offer my 2 cents since I've dealt with the same stuff, and a hair algae outbreak as well. I am not downing anyone else's opinion, hopefully mine will help. You have to remember any out break of algae in your system has to be fueled by something. Hair algae and that brown crud won't grow unless something is feeding it. Yes, turning out the lights, or getting something to eat it will reduce its population, but unless you solve the root cause, it will just come back. These algae break outs are not necessary a bad thing. The stuff is consuming excess nutrients in your system, which is actually helping your system to stabilize. It looks ugly, but at the same time it is natural for it to form. With a newer system, it is often advised to control it by using a clean up crew and vigorous cleaning of the tank. Large water changes also help. The idea is you want the stuff you want to grow, such as corals, coraline algae, and stuff in your refugium to dominate the more efficient hair algae and diatoms. Your biggest weapon against this stuff is time, and patience. If you reduce your dosing and feeding so the algae cannot grow, you also risk preventing the good stuff from thriving as well.
So, what to do about it? My recommendation is a simple matter of good husbandry. Allow the algae to grow, but make sure you consistently harvest it out of the system by taking a brush to your rocks, and siphoning out the algae and the gravel (if you have a DSB, make sure you stick to the very top of the sand bed only). Compliment this process with consistent 10 percent weekly water changes. Make sure conditions are ideal for your corals and other "good" stuff to grow. In time, the stuff you want to thrive will out compete the algae for nutrients, and you'll have one of those beautiful tanks you see in the tank of the month pictures. Remember, in the ocean, algae plays a role in filtration, so expecting a tank completely free of algae is unnatural. This isn't to say you cannot do it, but at the same time, a little growth is not a bad thing. Hopefully, I didn't contradict myself too much to make it sound confusing.
