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Yes, I agree the levels might be too low, removing the carbon might allow levels to go a bit higher , thus allowing chaeto growth, I personally like chaeto because it doesn't completely starve the tank of nutrients like carbon does, it's cheap, and a natural way to lower phosphates levels, thus helping with any algae. How often do you feed, what do you feed, how often do you do water changes, and how big are water changes ? Your tank is 90 gallons correct?
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