The offered here Aquarium Biological Filter Media is perfect for anyone looking to create a natural environment for their fish. The stones are made of volcanic origin and have a porous structure that helps to retain toxic compounds. The zeolite in the stones will help to lower the level of ammonia and ammonium in the water, while also eliminating any toxins that may be dissolved in the water. These stones can be used for all types of biological filters and are sure to provide your fish with a healthy and clean habitat.

We combine postage for multiple products. If there are any questions you have then please get in touch before you place an order. Thanks for looking!