Fish Tank Filter Media Packs

Getting the balance of media right makes a real difference to water quality: mechanical media catches debris, while biological media hosts the bacteria that break down fish waste, so a pack combining both gives your filter everything it needs to keep water clear and safe between cleans. When choosing a pack, match its capacity to your tank's volume and stocking level rather than just the filter model, as heavily stocked tanks benefit from a bit of extra biological media. If you're unsure how much filtration your setup really needs, our Best Fish Tank Filters: A Practical Buying Guide can help you work it out. Replacing media in stages, rather than all at once, also helps preserve the bacterial colony and avoid new tank syndrome after a clean.