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Will be placing an order tonight and need to know if Seachem Matrix Bio and Rena;s Bio Chem-Stars do the same thing and can I combine the two or just choose one or the other?
+1 Biomedia is just a material that has a lot of surface area per volume. Any porous material that's aquarium safe could be used as biomedia. The ceramic stuff you're looking at just has a lot more surface area per volume than most other materials.