Terrible Advice Tuesdays: Activated Carbon Ruins Half of 2-Part Dosing

Terrible Advice Tuesdays (T.A.Tues): You shouldn’t run a carbon reactor if you are dosing calcium/magnesium because the carbon will absorb the calcium/magnesium.

The rest of the story: I’m laughing so hard it hurts. Truly this advice is amongst the worse I’ve ever heard. Activated carbon absorbs dissolved organic molecules. These organic molecules are large, complex molecules comprised of lots of different elements. In other words, NOT calcium or magnesium.

If you are dosing Ca/Mg, don’t worry about the activated carbon in your carbon reactor absorbing those elements. Everything will be fine.

Back to laughing now.

(Thanks to Darien, one of my VIP clients, for sharing this terrible advice that he heard at his local fish store)

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Comments for this article (5)

  • Lee Sweeting says:

    Haha! Tales from your LFS :-). I was once told that if i used LED lights, i wouldn’t get algae in my tank. Terrible advice!!!

  • Vic Brincat says:

    Mark, what about GFO reactors? Any impact on Mg or Ca?


  • Lee Sweeting…that’s it. Time to rewrite my algae guide! Just buy LEDs! HA!

  • Lonny says:

    How about products like chemi pure elite? I assume since a gfo reactor wpuldnt.strip trace.elements the gfo present in chemi pure would not either? Asssuming my assumption is correct…would you prefer to run that (thinking about trying chemi pure blue)or running a carbon/gfo reactor?

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