Canister vs Hang-On-Back Filter
The two most popular filter types for a mid-to-large tank. A canister hides under the cabinet and filters more water; a hang-on-back (HOB) clips on the rim and sets up in minutes. We compare them using the Fluval 407 and AquaClear 70 as examples.
The quick verdict
Choose a canister like the Fluval 407 when the tank is big, planted or heavily stocked and you want maximum media, quiet running and clear back glass. Choose a hang-on-back like the AquaClear 70 when you want strong, simple filtration on a mid-size community tank with no under-cabinet plumbing, priming or expense.
| Canister (Fluval 407) | Hang-on-back (AquaClear 70) | |
|---|---|---|
| Flow rate | 1450 L/h | 1136 L/h (adjustable) |
| Rated tank size | Up to 500 L | 152–265 L |
| Media capacity | ≈ 7.6 L across 4 baskets | Large refillable basket |
| Setup | Hoses, priming, cabinet space | Hangs on rim, no plumbing |
| Noise | Very quiet, hidden in cabinet | Quiet, some outlet splash |
| Back glass | Clear (filter hidden) | Box visible on the rim |
| Cost | ≈ $250 | ≈ $75 |
Capacity and quiet vs simplicity and price
A canister wins on the numbers: more flow, far more media, and it lives silently in the cabinet so nothing shows on the glass. That capacity is what keeps a big or planted tank crystal clear. The price is cost, hoses and a priming step. A hang-on-back trades some of that for real convenience — the AquaClear 70's refillable basket holds proper foam, carbon and BioMax, its flow is adjustable, and it sets up in minutes with nothing to plumb. On a 150–265 L community tank that's often all the filtration you need.
Which should you buy?
Our pick
For a big, planted or heavily-stocked display, buy the canister — the Fluval 407 is our all-round pick. For a straightforward mid-size community tank where simplicity and value matter most, the hang-on-back AquaClear 70 does the job for a third of the price. Compare every option and the 4× turnover rule on our aquarium filters hub.
Frequently asked questions
Is a canister or hang-on-back filter better?
It depends on the tank. A canister like the Fluval 407 filters more water, holds far more media and hides under the cabinet with the back glass clear — ideal for bigger, planted or heavily-stocked tanks. A hang-on-back like the AquaClear 70 is cheaper, needs no plumbing or priming ritual, and sets up in minutes — perfect for a straightforward community tank. Big or planted: canister. Simple mid-size: HOB.
Does a hang-on-back filter filter as well as a canister?
For a normally-stocked mid-size tank, a good HOB with a refillable basket (like the AquaClear 70) does the job well, holding real biological media and clearing 4× turnover. But a canister holds much more media, runs more quietly and keeps a bigger or heavily-planted tank clearer. On a big display the canister wins; on a 150–265 L community tank the HOB is often all you need.
Which is easier to maintain, a canister or a HOB?
The hang-on-back is faster for a quick service — you lift the media out from the top with no hoses to disconnect, and you can clean one stage at a time to protect your bacteria. A canister takes a little longer but tool-free baskets and quick-disconnect valves have narrowed the gap. For minimum fuss, the HOB; for filtering a big tank, the canister earns its extra minutes.
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