Seachem Matrix Bio Media, 1 Litre

I bought this Seachem Matrix to add to my main Fluval 307 external filter, and it has been absolutely brilliant. It is highly recommended in the fishkeeping world for a reason, and now I completely see why. The biggest benefit of this stuff is its incredible surface area. Unlike standard ceramic rings that are only smooth on the outside, Matrix is packed with thousands of microscopic internal pores. This means it provides an absolute massive amount of space for beneficial bacteria to colonize and grow. It handles ammonia and nitrite like an absolute champion, keeping the water parameters perfectly stable and safe. Plus, because of its unique structure, it even supports anaerobic bacteria deep inside the pores, which helps knock down nitrate levels too—something very few other media can actually do. It doesn't clog up, it doesn't degrade or wear away over time, and it fits perfectly into the Fluval baskets without restricting the water flow at all. It honestly takes your filtration to a whole new level. If you want a healthy ecosystem and crystal-clear water, this is the best upgrade you can give your filter. Easily a 5-star product!

I use Matrix across all four of my aquariums, and it’s become my “buy once, trust always” biological media. It’s reliable, easy to use, and delivers the same steady performance no matter which filter I drop it into—canister, HOB, internal, or a sump basket. What I notice in day‑to‑day use The fish stay happy and the water stays stable. Matrix gives beneficial bacteria tons of room to colonise, which helps process waste efficiently and keeps parameters on an even keel. It’s properly “set and forget.” Once it’s in place, I don’t have to babysit it or swap it out every few months. A quick rinse in old tank water during maintenance is all it usually needs. It doesn’t crumble or compact like some ceramic rings. The pieces keep their shape, so flow through the media stays consistent. Ease of setup Rinse it once to remove any dust, pop it into a media bag, and place it after your mechanical stage (sponges/floss). That way, debris is caught before it reaches the Matrix, and the bacteria get clean, well‑oxygenated water. It works in small and large amounts—handy if you’re seeding a new tank or boosting capacity in an established one. Maintenance & longevity I only swish it in tank water when I’m doing a water change. No fancy routines or chemicals required. Because it lasts for years, it’s great value. You’re not constantly replacing media, so the cost evens out quickly—especially if you’re running multiple tanks like I am. Performance tips from my setups Don’t overpack the media bag; allow water to flow through freely. Keep a decent mechanical pre‑filter ahead of it. Less gunk on the Matrix means healthier bacterial colonies and less cleaning for you. It’s not a substitute for water changes, but it makes the system far more forgiving between services. Verdict Matrix is my go‑to for a reason: consistent results, low effort, and excellent durability. After trying plenty of alternatives, this is the one I trust across all four aquariums. For me, it’s the platinum standard of biological media—simple, effective, and worth every penny.

Super produkt, delivery great, good size, value for money.

This stuff has been a game changer in my setup. I was weekly having to do around a 50% water change to keep my nitrates in check as they were nudging up to 40ppm sometimes. My tank is a well stocked freshwater mostly American Cichlid tank. I have been running 1 litre of this stuff for the last 3 months and my weekly nitrate check is now more like 5ppm. My last weekly water change was more like 20% and still nitrates have stayed this low. I run it in a sump in the last section with the return pump and heaters, I was careful to make sure the flow is within the range this stuff is meant to be effective. I'm so impressed that I've put another litre in, it does take sometime to get to work but excited to see if it will go even lower.

Very good product, delivery took over a week so that why only 4 stars

Used matrix on my discus tank years ago and ammonia and nitrates always 0 and 0 . nitrate we're 30 or 40 ppm by the end of week , but after 4 or 5 months nitrates hovered around 15 ppm with no other changes to set up . I did have double the amount recommended and it took 2 months to cycle a brand new tank. So 6months from adding to notice a lowering of the nitrates but that's still excellent . But I wouldn't use any other bio media and I've just bought more for a smaller 200ltr tank .

Just what I needed for my 105l tank setup,using this inside my Oase 350 thermo filter as ive got an over populated tank and wanted something that would thrive and keep the good bacteria going along with a good clean up crew this has made clean up less of a thing and only needing to do top ups. Would highly recommend and will be using in my next setups aswell.

As expected

Bon

Prodotto di ottima qualità, con una grandissima capacità di filtrazione biologica. I materiali sono ben realizzati e si integrano perfettamente nel filtro, contribuendo a mantenere l’acqua pulita e stabile. Lo sto utilizzando con grande soddisfazione: ottimo rapporto qualità-prezzo e una soluzione che consiglio assolutamente a chi vuole migliorare la filtrazione biologica del proprio acquario.

Product arrived as described. Very little powder and very few garbage stones. My thermo 600 took all x4l. Will update x4 months from now on performance changes. Replaced ceramic rings and sintered glass bio balls from Ehiem. Make sure u wash thoroughly and soak for 24hrs to keep the floaters to a min. Update; working well in my 600, all my values are 0 and the water is crystal clear with just a little yellow due to wood in tank. All x4l went into my 600, flow is good with the 45ppi ring sponges on pre filter. Taken x7 weeks for these results. PH is stable at 7 to 7.1 Great stuff but still expensive!

Ich nutze Seachem Matrix jetzt seit über einem Jahr in meinem Filter und die Wasserwerte sprechen für sich. Für mich gibt es aktuell kein besseres biologisches Filtermedium. Das hat mich überzeugt: • Enorme Oberfläche: Durch die extrem poröse Struktur bietet es viel mehr Platz für nützliche Bakterien als normales Keramik- oder Sinterglas-Filtermaterial. • Perfekter Schadstoffabbau: Ammonium und Nitrit sind absolut kein Thema mehr. Sogar der Nitratwert sinkt spürbar, da sich im Inneren der Steine auch anaerobe Bakterien ansiedeln können. • Lebenslange Haltbarkeit: Das Material nutzt sich nicht ab, zerfällt nicht und muss im Grunde nie ausgetauscht werden. Beim Filterputz einfach kurz im Aquarienwasser ausspülen – fertig. Fazit: Seachem Matrix ist jeden Cent wert. Es sorgt für ein stabiles biologisches Gleichgewicht und glasklares Wasser. Absolute Kaufempfehlung für jeden Aquarianer!

Excellent product , recommend to buy . A word of caution as it’s pretty expensive compared to similar products . Wish they would make it more cost effective over time .