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Old 11-21-2004, 05:58 PM   #1
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Very surprised: new carbon made green water go away

I just changed the filter cartridge (the kind with carbon inside) in my HOB for the first time in several months. I was surprised that this cleared up my water. It had been slightly green before. I think carbon only removes chemicals, and I am guessing that the green was from water-born algae. Does anyone know what caused the green algae and why new carbon made it go away?

I know someone will ask about water parameters so:
PH 7.6
ammonia 0
Ites 0
Ates 15
GH 8
KH 4
My tank is fully (if not over) stocked with HOB and UGF. It has several plants, 40Watt fluorescent. I lightly dose iron potassium and trace.

Any thoughts? TIA

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Old 11-21-2004, 07:42 PM   #2
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carbon removes heavy metals. it might've removed the iron.

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Old 11-21-2004, 09:31 PM   #3
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I agree...may have also removed some extra nutrients floating about...just enough to stop the algae bloom.
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carbon, green water

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