No particular brand. whatever I can find cheap.
I've tried SeaChem Matrix, Kent, and currently on a can of Marineland.
Only difference I've noticed is price. so I gave up and just buy the cheapest one.
A little extra dust isn't a big deal, just rince it longer.
Use 1.5-2 cups along with a cup of purigen (separate bags) inside an eheim 2213 cannister.
Change every month or 2.
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