Aquatic Experts - Premium Activated Carbon Aquarium Water Filter Charcoal Media with Fine Mesh Bag, 5.5 lbs

I love how small the granules are and the fact that it's prewashed thoroughly! It works great in my tiny nano tank's internal filter box instead of its normal cartridges. I put this company's filter first product at the bottom where water first enters, then polishing pad from them as well, then these carbon granules and finally my bio media on top. I've pretty much jam packed my filter box with almost all of their products and I still have beautiful water flow and my tank is way more stable than if I were to just use the recommended cartridges. I just wish they made a tiny little filter bag so I don't have to use pantyhose haha, Thank you Aquatic experts :)