Aquarium Filter Guide: Sponge vs. Hang-On-Back vs. Canister
The filter is the life support system of your aquarium. It not only clears visible debris from the water but also houses the beneficial bacteria mentioned in our Cycling Guide.
1. Sponge Filter for Small Aquariums
Best For: Bettas, Shrimp, Fry (Baby Fish).
Sponge filters are powered by an air pump. They provide very gentle flow and are impossible for small fish to get sucked into. They are excellent biological filters but do not remove fine particulate matter as well as power filters.
2. Hang-On-Back (HOB) for Community Tanks
Best For: Most Community Tanks (10 to 50 Gallons).
These hang on the rim of your tank. They are the most popular choice because they are easy to access and clean. A good HOB should have space for custom media (sponges and ceramic rings) rather than just disposable cartridges.
3. Canister Filter for Large Fish Tanks
Best For: Large Tanks (55+ Gallons) and messy fish (like Goldfish or Cichlids).
Canisters sit inside the cabinet under the tank. They offer massive media capacity and high flow rates. While harder to clean, they keep equipment hidden and provide superior water quality for heavy bioloads.
Not sure how much power you need? Use our Main Calculator to see the recommended GPH (Gallons Per Hour) flow rate for your specific tank dimensions.
Our Top Pick for Beginners
For most standard setups, the Fluval C-Series offers the best balance of power, customizable media slots, and easy maintenance.
Check Price of Fluval C4 Filter