In a planted tank nitrate is something we add, not remove, so don't use a nitrate remover. Ammonia is something the plants can eat, so removing that is a good idea only if you expect an unusual load of ammonia, like with the first few weeks of Aquasoil usage. Almost anything with lots of surface area works as a biological media, even well used charcoal pieces, but I just use the small bag of it that came with a small Fluval filter, but in my Rena XP3. Other than that I use sponges, from coarse to fine.
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