Brown algae is NOT a result of high phosphate. In fact, no algae is. Brown algae occurs when 1 or more of the following happens.
New tank cycling: Common and will go away on its own.
Poor water flow: Not enough water movement.
Inadequate lighting: More light is needed.
Water high in silicates: The foundation of diatom algae. Hard water can be a problem but fixing the other causes will minimize this effect.
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