Chicxulub
The Hand of the King
Matrix is good, along with Hagen/Fluval Biomax and Eheim's Substrat.
Another alternative is allowing pothos vines to grow hydroponically in your tank. Stick cut ends into the water, let it grow roots and watch your no3 disappear. I had a colony in an old HOB on one of my big tanks and no3 never got above 10ppm. I'm a firm believer in pothos.
i wasnt expecting it to get rid of nitrates i know the best way for that is either an algae scrubber or constant wc's but i was just wondering if it had a good surface area for biological bacteria cause it looks pretty smooth to me but i've only ever saw it in a bottle i havent ever felt it yet.
Another alternative is allowing pothos vines to grow hydroponically in your tank. Stick cut ends into the water, let it grow roots and watch your no3 disappear. I had a colony in an old HOB on one of my big tanks and no3 never got above 10ppm. I'm a firm believer in pothos.