Canister Filter vs Hang-on-Back: Which for Your Tank?
Canister filter vs hang-on-back filter compared: media capacity, flow, noise, maintenance, tank size and which suits your aquarium.
The short version
A hang-on-back is cheaper, easier to service and perfectly adequate up to roughly 55 gallons. A canister holds far more media, hides under the cabinet, and is what a large or heavily stocked tank needs. Buy the hang-on-back for a first tank under about 55 gallons; buy the canister for larger tanks, planted tanks or anything heavily stocked.
At a glance
| Fluval 407 Canister Filter | AquaClear 70 Power Filter | |
|---|---|---|
| Media capacity | Very large | Modest |
| Tank size suited | 55 gallons and up | Up to about 70 gallons |
| Maintenance | Less often, more involved | Quick, monthly |
| Noise | Very quiet, in the cabinet | Slight waterfall sound |
| Visible in the tank | Only intake and outflow | Hangs on the rim |
| Price | Much higher | Much lower |
Choose the Fluval 407 Canister Filter if…
Your tank is large, heavily stocked, or planted with a lid you do not want to cut. Media volume is what actually determines biological capacity, and a canister holds several times what a hang-on-back does. It also gives you room to run specific media such as extra biological or chemical stages.
Check Fluval 407 Canister Filter on Amazon
Choose the AquaClear 70 Power Filter if…
You are setting up a first tank or anything up to around 55 gallons. The AquaClear design in particular is well regarded because you choose your own media rather than buying proprietary cartridges, which is both cheaper and better for the bacteria colony.
Check AquaClear 70 Power Filter on Amazon
Reviewed in depth
Once you have picked a category, the individual units are covered in depth. On the canister side we have looked at the Fluval 207 for tanks up to about 40 gallons, the OASE BioMaster 2 Thermo 350 for keepers who want the heater out of the display, the Marineland Magniflow 400 as the value option, and the Fluval FX6 for heavily stocked big tanks. On the hang-on-back side, the Seachem Tidal 75 review covers the surface-skimming design that fixes an oily film.
Related
Comparison based on published manufacturer specifications and the general consensus of owner reports. We have not tested these products side by side. Confirm current specifications and prices before buying. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.
Frequently Asked Questions
What filter flow rate do I need?
A common rule of thumb is four to six times the tank volume per hour for a community tank, more for messy fish like goldfish or cichlids. Our filter sizing calculator works this out from your actual tank and stocking.
Do cartridge filters harm the cycle?
They can. Throwing away a cartridge every month throws away much of your beneficial bacteria. Filters that let you keep and rinse permanent biological media, rather than replacing a disposable cartridge, are far kinder to the nitrogen cycle.
Can I run two filters?
Yes, and it is a good idea on larger tanks. Two smaller filters give redundancy if one fails and let you clean one at a time so you never disturb the whole bacterial colony at once.
Planning or running a tank?
Use our free calculators and guides to get every number right.
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