![]() (If you aren’t familiar with the three types of filtration – mechanical, biological, and chemical – you can read our article called Fish Tank Filters: Which One Should You Get?)Ī prefilter sponge is a foam cylinder that fits over the intake tube of your hang-on-back or canister filter, like a sock on a foot. Therefore, one of the easiest ways to encourage their growth is to increase the amount of surface area in your tank with a prefilter sponge. They tend to grow on any underwater surface, including the gravel and walls of your aquarium. ![]() Step 1: Get a Prefilter Spongeīeneficial bacteria are a naturally occurring form of biological filtration that consume the toxic nitrogen compounds produced by your fish’s waste, thus making the water safer for the fish to live in. In this article, we teach you how to optimize your aquarium filter in four simple steps, using only a pair of scissors. Have you ever bought a new hang-on-back filter from the pet store and noticed that the instructions say you have to change out the filter cartridge at least once a month? Most beginner fish keepers don’t realize that you can replace those disposable cartridges with reusable filter media that can last for the lifetime of the filter.
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