Originally Posted by mr_X
I don't even know what "matrix" is. I googled it and came up short. That said, it's just another type of surface area. Anaerobic bacteria is what converts nitrate to nitrogen gas. If this media doesn't have low oxygen zones like live rock does where this bacteria can reside, it's not going to positively effect nitrate.
Got this of another forum.. It does say on the box it works for Nitrates. Its about $35 in Australia for a litre.
" Excellent Nitrate Media
I just want to recommend Seachem's Matrix biomedia for nitrate removal. For about 6 months, I have been using plastic bioballs in the back of my Aquapod. Even with weekly water changes, minimal feeding, and keeping a light bioload, I could never get my nitrates under 5ppm. At one time, I took a reading of 10ppm. I noticed that many people use Seachem's de-nitrate. I checked it out, and noticed that Seachem recommends a flow rate of no more then 50gph. Anything higher, and they recommend Matrix. So I bought 1 liter (enough for 100 gallons) to try on my 35 gallon system (sometimes more is better). I've been using it for 3 weeks, and now my nitrates are at undetectable levels. What sold me on this product is when Seachem stated that 1 liter (the amount I used) is equivalent to 10 gallons of plastic bioballs. This was music to my ears since I am always pinching for space in my nano reef. All in all, I am very happy with this product, and recommend it 100%. For more info check out Seachem Laboratories: Innovative Pet and Aquarium Products . This stuff is hard to find. I bought it from petmountain.com for about $11.00 I think.."