Bigger filters are not always better for your aquarium. Although the actual size of the filter is not the primary concern, if your filter is too big, it may not fit or work on your aquarium. The main issue with using a larger filter than recommended for your habitat is its strength. A bigger filter may be too strong, generating more water flow and causing problems along with increased filtration.
The aquatic life you’re keeping in your aquarium will be sensitive to ideal underwater conditions, and there are types of fish and plant life that won’t do well with strong water currents. If your fish are small, the large filter and the current it generates may even suck them into the water inlet. The best aquarium filter for your habitat will be one tailored to match the size. Ideally, the number of gallons in your aquatic environment should be filtered at least four times per hour. For example, if your tank is 25 gallons, it will require a filter with at least a 100 US Gal/h capability.