Sobo WP-408H Slim Hang-On Aquarium Filter | up to 100L (2–3 ft) | Fish Bazaar

The Sobo WP-408H slim hang-on aquarium filter is a compact, affordable hang-on-back (HOB) filter for small fish tanks up to roughly 100 litres (around 2 to 3 feet), with a slim profile that takes up almost no space behind the tank. It hangs on the rim, cascades filtered water back in, and provides simple, effective 3-stage filtration — making it one of the best-value small aquarium filters available in India for nano and community tanks.

What is the Sobo WP-408H Filter?

Short answer: A slim, budget hang-on-back (HOB) aquarium filter for small tanks up to about 100 litres.

In detail: The WP-408H clips onto the back rim of the tank with a slim body that barely protrudes, lifts water through a filter cartridge, and trickles it back over the surface. It is easy to install, easy to clean, and delivers approximately 680 litres per hour (check the listing for the exact rating). For example: on a 2–3 foot community or nano tank, the WP-408H keeps the water clear and the surface moving without the cost or bulk of a canister.

Key Features

• Slim hang-on design — takes up minimal space behind the tank.
• ~680 LPH flow — good circulation for small tanks (verify on the listing).
• 3-stage filtration — mechanical, biological and chemical in the cartridge.
• Surface agitation — the return flow aerates the water.
• Easy maintenance — quick cartridge access for cleaning.
• Excellent value — effective HOB filtration at a low price.

Benefits

Immediate: Clear water and gentle surface circulation from day one, with simple hang-on installation.

Short-term: The filter media matures into a biological filter, keeping ammonia and nitrite at zero.

Long-term: Dependable, low-cost filtration for small tanks, with cheap and easy media changes.

How It Works

The pump lifts water through the cartridge — mechanical media traps debris, biological media grows the bacteria that convert toxic ammonia to nitrite and nitrate, and chemical media (carbon) polishes the water — then returns it over the surface. See how aquarium filters work.

Which Tank Size Is the WP-408H For?

Short answer: Small tanks up to about 100 litres — roughly 2 to 3 feet.

Suitable For

• Nano and small community tanks (guppies, tetras, platies)
• Beginner and budget setups
• Keepers who want a space-saving slim filter

Not Suitable For

• Tanks over 100 L — choose a larger HOB such as the Seachem Tidal 55 or a canister
• Heavily-stocked or messy-fish tanks — limited media capacity
• Rimless tanks where a HOB cannot hang securely

Setup & Usage

Hang the filter on the back rim, load and fit the cartridge, prime it by filling with tank water, and switch on. Rinse the media in old tank water every 2–4 weeks. Allow 4–6 weeks to cycle. See the installation guide.

Technical Specifications

Common Problems It Solves

Limited space: the slim body barely protrudes behind the tank. Tight budgets: effective HOB filtration at a low price. Cloudy water in small tanks: 3-stage filtration keeps it clear. Low oxygen: the return flow agitates the surface.

Sobo WP-408H vs Other Filters

Expert Recommendation

For a nano or small community tank where space and budget matter, the Sobo WP-408H is our top slim-HOB pick. Add a little TCWS Bio-Media to boost biological capacity, and in warm Indian summers pair it with a Sobo air pump for extra oxygen.

Frequently Asked Questions

What tank size is the Sobo WP-408H suitable for?

Small tanks up to about 100 litres — roughly a 2 to 3 foot aquarium.

What is the flow rate of the WP-408H?

Approximately 680 litres per hour — please check the product listing for the exact rating.

Is the WP-408H a hang-on filter?

Yes — it is a slim hang-on-back (HOB) filter that clips onto the rear rim of the tank.

Is the Sobo WP-408H good for beginners?

Yes — it is simple, affordable and easy to maintain, making it a great first filter for small tanks.

Does the WP-408H come with media?

Yes, it includes a filter cartridge; you can add bio-media such as TCWS Bio-Media for more biological capacity.

How often do I clean the WP-408H?

Rinse the media in old tank water every 2–4 weeks; never under the tap, as chlorine kills the bacteria.

Is the WP-408H quiet?

Yes, when primed and topped up; keep the water level correct so the pump does not run dry.

Can I use the WP-408H on a betta tank?

Yes, on a small betta tank — baffle the outflow if the current is too strong, as bettas prefer gentle flow.

Can the WP-408H be the only filter in my tank?

Yes, for small tanks up to about 100 litres it provides complete filtration on its own.

Is the Sobo WP-408H good value in India?

Yes — it is an affordable, space-saving HOB, ideal for nano and small community tanks.

Do I need an air pump with the WP-408H?

Not usually, but in hot Indian summers an air pump adds extra oxygen.

Related Products & Guides

Step up: Seachem Tidal 55 or Fluval 107. Top filter option: Sobo WP-880F. Media & aeration: TCWS Bio-Media, Sobo air pump. Collections: Aquarium Filters, Filters & Filtration. Guides: Types of Aquarium Filters, Canister vs HOB vs Sponge.

Conclusion

The Sobo WP-408H slim hang-on aquarium filter is a compact, affordable, easy-to-use choice for small tanks up to about 100 litres (2–3 ft). With a space-saving slim design and simple 3-stage filtration, it keeps nano and community tanks clear and healthy — one of the best-value small aquarium filters in India.