Brown sounds like diatoms. Check your water source for high silicates, once the silicate is gone, the bloom will go away. A diatom filter would clear the water rather quickly.
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"Things should be made as simple as possible, but not simpler." (oft attributed to Einstein; most likely paraphrasing by Roger Sessions; compactly articulates the principle of Occam's Razor)
Current Tank Info: 325 6' wide Reef
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