HotRocks
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My Tank Thread
The MFG (MarineLand) claims the bio-wheel will not absorb any meds, including copper.
But I get lied to by manufacturers/vendors all the time, so I guess a controlled test is in order to verify their claim.
I use marineland HOB bio-wheel. I do encounter some absorption with copper, but I figured it was filter floss I have in the HOB as well. Maybe a test is in order...