When talking to aquarium lovers you may hear the term HOB.
HOB
Hang on Back - referring to a hang on back filter. Hang on back filters are very common in most aquariums. Their universal design makes them work on almost any aquarium from very larger aquariums(100 gallons+) to small aquariums(5 Gallons)
Hang on back filters are one of the three most popular aquarium filters. The other filters are sponge filters and canister/sump filters. Each filter has its benefits and is built for different aquariums.
HOB PRO/CON
| Pro | Con |
| Affordable $ | Does not provide as much filtration as other filter styles |
| Slim and easy to set up | May be too powerful for smaller aquariums |
| Universal | |
| Easy to clean and replace filter media |
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