I added this to a reactor after I dosed chemiclean in my 125g reef tank to remove the excess chemiclean in the water system after a 40g water change. It not only took out all the chemical but it also cleared up the water a lot more and made my corals open up more. The reactors flow is only enough to move the top layer and not have it bouncing around all over the place. You do need a sponge or screen in your reactor since its small spheres unlike traditional carbon. I used different carbon before which took longer to take out chemiclean before then matrix did.

Carbon doing great job. have to wait and see how long it last. Water very clear and looks great

This is a low dust spherical carbon that works great in reactors. Compared to other carbons I've tried, I can get a higher flow through the reactor without tumbling (tumbling carbon is bad, it breaks off fragments that can harm your fish) and it rinses clear much faster. This pairs up well with Phosguard, which is much easier to deal with than GFO for similar reasons.

Nitrate levels stayed at a constant high level, according to the company representative this product will bring nitrate levels down in a salt water fish tank. There was no difference. I would not recommend this product. Spend the extra money and purchase a protein skimmer, use in conjunction of your charcoal/whisper filter for results!

My aquarium water since I started using this carbon is noticeable clearer and as I have tested, has less chemical compounds

A high quality product, just be sure to rinse thoroughly before using. My 40 gallon breeder, mixed reef (SPS & LPS) with no protein skimmer and 2 Aqueon HOBs stays crystal clear with nitrates always below .2 ppm, thanks to Matrix Carbon and Seachem's other Matrix product.

I am a huge fan if Seachem products & it's all because if this product. I've used other carbons in my H.O.T. Magnum canister filter & will NEVER use anything else but MatrixCarbon! The spherical shape of the carbon and how strong each one is, is amazing! The other carbons I've used looked like it was the left overs that fell on the floor and would disintegrate just by squeezing it between my fingers. MatrixCarbon does not compact like other carbons either & that is why I will never use anything else!

Absolutely the best carbon available. Longest lasting, cleanest media I have ever used in 25 years.