Aquarium Filters

Cloudy aquarium water after a water change usually points to stirred debris, a bacterial bloom, or a chemistry mismatch. Learn how to narrow it down fast.

Choose 80–160 GPH for a 20-gallon freshwater tank, then match filter type, media, and flow to your fish and maintenance routine.

Rinse biological media in dechlorinated tank water, replace mechanical floss when it will not rinse clean, and keep most bio-media untouched.

Rinse one chamber at a time in tank water, keep biological media mostly intact, and clean mechanical media when flow drops.