Review on 2-Quart Bio-Filter Media for Marine and Freshwater Aquariums, 1.5-Inch Sphere by Sarah Abarca

This is a fantastic product. I put them in one of my pallet baffles and let the tank run for about 6 weeks. I then tried adding ammonia to a tank with flakes, mysis shrimp, raw king prawns, a piece of walleye, and even a shot glass full of pure ammonia and didn't get a positive ammonia test. I thought I was doing the test wrong but two LFSs confirmed there was not a single ammonium in the water. The image is a bit cracked due to the red light from the plants in the joint, but you can see the placement of these spheres. It works like a charm. By the way, that's the light out of the joint. The thing works a lot better than I expected. There are so many hetos in my fugue that it's almost annoying.