What's IN the filter? - The Planted Tank Forum
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post #1 of 2 (permalink) Old 12-09-2014, 01:08 AM Thread Starter
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What's IN the filter?

I only just added live plants to our tank in the last 6 months or so. We have a Fluval G3 cannister and an HOB. Both of them contain carbon. Is this a mistake? I ask because I just read a reply in another thread that said activated carbon doesn't go well in a planted tank, that is starves the plants.

So am I stunting & starving my plants by running carbon in my filters?

BTW I broke this out of the other thread because I wanted to focus on the carbon issue/my personal confusion. I hope that I don't offend the OP by doing this!
Nuthatch is offline  
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post #2 of 2 (permalink) Old 12-09-2014, 01:12 AM
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Activated carbon does not starve the plants.
Activated carbon has some affinity for some of the chelated forms of fertilizers. Usually iron is the only one dosed as a chelate. Read the label on whatever ferts you are using, see what form they are in.

Activated carbon usually reaches a saturation in just a few days, so even if it did remove some fertilizer the effect stops, so the plants are getting fertilizers until you add new AC.
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