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Just a brief look at them, and they seem to be more of a chemical filter than a bio-filter.....anyone please educate me here too.
Why not go with some base rock and add a little LR over time?
Rock does more than hosts the bio-filter, like dividing the tank for territory and providing hiding spaces as well as sleeping quarters...
I guess there is bio-filtration in there to, I found this: http://www.bioconlabs.com/abtqs.html
It seems mostly to reference FW applications.