Part of the cycling process - called diatoms. Once all the silicates are used up in your water they will cease to bloom. Astrea snails are a good control for them. If your water, (either make up or change water), is high in silicates you may experience future blooms. RO/DI water will help keep this in check. Skimmers help with nitrate export and therefore wouldn't help much with diatoms, but definitely get one before you add bioload to your tank or you will get hair algae and blue, green, or red cyanobacteria which thrives on nitrates and phosphates. Get snails, be patient, and the brown diatoms will clear themselves up, but DO get a skimmer... 
Happy reefing!
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135G Mixed Reef. Bullet 2, 25 gal refugium, 2 X250W MH + 4X 96W PC\'s, DIY Calcium Reactor, Coralife 1/6 HP Chiller, Phosban, Tunze, 2 closed loops & SQWD\'s, Seios, Coralife 4 stage RO/DI & a bunch of other expensive gadgets... I may never retire, but I'm gonnahavahelluvanaquarium!
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