Canister Filter vs Hang-On-Back (HOB)
Canister vs hang-on-back filter comparison. Real differences in maintenance, capacity, noise, hidden vs visible placement, cost, and which is right for your tank size.
Side-by-side comparison
| Attribute | Canister filter | HOB filter | Winner |
|---|---|---|---|
| Best tank size | 40-150 gallon | 10-40 gallon | Tied |
| Initial cost | $130-400 | $25-80 | HOB |
| Capacity (media volume) | 4-12 liters | 0.5-1.5 liters | Canister |
| Maintenance frequency | 2-4 weeks (less often, more thorough) | 1-2 weeks (quick rinse) | Canister |
| Noise level | Silent (hidden under tank) | Mild waterfall hum | Canister |
| Visibility | Hidden in cabinet | Visible from outside | Canister |
| Maintenance complexity | Disassemble cabinet, prime, restart | Lift lid, rinse, drop in | HOB |
| Leak risk | Real if seals fail | Negligible | HOB |
| Customizability | 4-stage media chambers | Fixed slot for media | Canister |
| Surface agitation | Low (return below water) | High (waterfall) | HOB |
Frequently asked
Are canister filters better than HOBs?
Better for tanks 40g+. Below 40g, the cost premium isn't worth it - HOBs do the same job for 1/4 the price.
Do I need a canister for a planted tank?
Recommended for 40g+ planted tanks. The hidden plumbing + glass lily pipe outputs preserve aquascape aesthetics. Not required - many planted tanks use HOBs successfully.
Best canister filter brands?
Eheim Classic + Pro4 (most reliable, expensive), Fluval 07 series (best value), Oase BioMaster (easiest maintenance), Marineland C-series (budget).
Best HOB brands?
AquaClear/Fluval (most customizable), Seachem Tidal (clearest design + magnetic skimmer), Marineland Penguin (cheapest with biowheel).
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