I have Brown algea in my tank to. I was told it is because of it being new. The best way to know when your cycle is done or what is doing is by doing a test.
55gallons, emperor 400 hang on filter, 150watts heater, Coralife 256watt light, 60 LB Live Sand, 43 LB Live Rock, ProClear Aquatics Pro 150 Wet/Dry Filter with Skimmer, 12 Blue Leg Hermit Crab, 2 Scarlet Skunk Cleaner Shrimp , 1 Algae Blenny, 3 Green chromis, 3 Peppermint Shrimp, 4 Scarlet Reef Hermit Crab, 3 Emerald Mithrax Crab, 1 Porcelain Anemone Crab, 1 Feather Duster, True Bulb Anemone, 3 Ocellaris Clownfish, 15 Margarita
Snails, 2 Nudibranch, 6 Astraea, 5 cerith snails and 1 Japanese Pistol Shrimp. Updated 02/02/06