brownish algae

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Well you don't want green algae :) What does the brown algae look like? It could be diatoms which are normal but rather ugly; they'll go away on their own. Is the water brown or is it on surfaces? Can you get a pic?
 
That's diatomes. A Google search will tell you everything you wanted to know about it but its most common in newly established tanks and goes away as quickly as it showed up.
 
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