{"product_id":"sobo-wp-308h-slim-aquarium-filter-power-aquarium-filter","title":"Sobo WP-308H Slim Hang-On Aquarium Filter | up to 70L (Nano–2 ft) | Fish Bazaar","description":"\u003cp\u003eThe \u003cstrong\u003eSobo WP-308H slim hang-on aquarium filter\u003c\/strong\u003e is a compact, affordable hang-on-back (HOB) filter for small and nano fish tanks up to roughly \u003cstrong\u003e70 litres (around 2 feet)\u003c\/strong\u003e, with an ultra-slim profile that barely protrudes behind the tank. It hangs on the rim, returns filtered water over the surface, and provides simple 3-stage filtration — making it one of the best-value small aquarium filters available in India for nano and betta tanks.\u003c\/p\u003e\n\n\u003ch2\u003eWhat is the Sobo WP-308H Filter?\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eShort answer:\u003c\/strong\u003e A slim, budget hang-on-back (HOB) aquarium filter for small and nano tanks up to about 70 litres.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIn detail:\u003c\/strong\u003e The WP-308H clips onto the back rim with a very slim body, lifts water through a filter cartridge, and trickles it back over the surface. It is easy to install and clean, and well suited to nano and small community tanks. Check the product listing for the exact flow rating. \u003cstrong\u003eFor example:\u003c\/strong\u003e on a 1.5–2 foot nano or betta tank, the WP-308H keeps the water clear and gently circulated without taking up space inside the tank.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltra-slim hang-on design\u003c\/strong\u003e — minimal footprint behind the tank.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGentle, small-tank flow\u003c\/strong\u003e — suited to nano and betta setups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-stage filtration\u003c\/strong\u003e — mechanical, biological and chemical in the cartridge.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurface agitation\u003c\/strong\u003e — the return flow aerates the water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy maintenance\u003c\/strong\u003e — quick cartridge access for cleaning.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGreat value\u003c\/strong\u003e — effective HOB filtration at a low price.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eBenefits\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eImmediate:\u003c\/strong\u003e Clear water and gentle surface circulation from day one, with simple hang-on installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShort-term:\u003c\/strong\u003e The media matures into a biological filter, keeping ammonia and nitrite at zero in small tanks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLong-term:\u003c\/strong\u003e Dependable, low-cost filtration for nano tanks, with cheap and easy media changes.\u003c\/p\u003e\n\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003cp\u003eThe pump lifts water through the cartridge — \u003cstrong\u003emechanical\u003c\/strong\u003e media traps debris, \u003cstrong\u003ebiological\u003c\/strong\u003e media grows the bacteria that convert toxic ammonia to nitrite and nitrate, and \u003cstrong\u003echemical\u003c\/strong\u003e media (carbon) polishes the water — then returns it over the surface. See \u003ca href=\"\/blogs\/news\/how-aquarium-filters-work\"\u003ehow aquarium filters work\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eWhich Tank Size Is the WP-308H For?\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eShort answer:\u003c\/strong\u003e Small and nano tanks up to about 70 litres — roughly up to 2 feet.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eTank length\u003c\/th\u003e\n\u003cth\u003eApprox. volume\u003c\/th\u003e\n\u003cth\u003eWP-308H suitability\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e1 ft\u003c\/td\u003e\n\u003ctd\u003e10–15 L\u003c\/td\u003e\n\u003ctd\u003eGood (gentle flow)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1.5 ft\u003c\/td\u003e\n\u003ctd\u003e25–35 L\u003c\/td\u003e\n\u003ctd\u003eIdeal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2 ft\u003c\/td\u003e\n\u003ctd\u003e50–70 L\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2 ft+\u003c\/td\u003e\n\u003ctd\u003e70 L+\u003c\/td\u003e\n\u003ctd\u003eStep up to the \u003ca href=\"\/products\/sobo-slim-filter-wp-408h-hang-on-filter\"\u003eSobo WP-408H\u003c\/a\u003e or a larger HOB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eSuitable For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eNano and small community tanks\u003c\/li\u003e\n\u003cli\u003eBetta tanks (gentle flow; baffle if needed)\u003c\/li\u003e\n\u003cli\u003eBeginner and budget setups\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eNot Suitable For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eTanks over 70 L — choose the \u003ca href=\"\/products\/sobo-slim-filter-wp-408h-hang-on-filter\"\u003eWP-408H\u003c\/a\u003e or a larger HOB\u003c\/li\u003e\n\u003cli\u003eHeavily-stocked or messy-fish tanks — limited media capacity\u003c\/li\u003e\n\u003cli\u003eRimless tanks where a HOB cannot hang securely\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSetup \u0026amp; Usage\u003c\/h2\u003e\n\u003cp\u003eHang the filter on the back rim, fit the cartridge, prime it 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 \u003ca href=\"\/blogs\/news\/how-to-install-aquarium-filter\"\u003einstallation guide\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eSobo WP-308H (slim hang-on)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter type\u003c\/td\u003e\n\u003ctd\u003eHang-on-back (HOB), slim\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSuitable tank size\u003c\/td\u003e\n\u003ctd\u003eup to ~70 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlow rate\u003c\/td\u003e\n\u003ctd\u003eSmall-tank rated (verify on listing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFiltration stages\u003c\/td\u003e\n\u003ctd\u003eMechanical, biological, chemical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBest for\u003c\/td\u003e\n\u003ctd\u003eNano \u0026amp; betta tanks up to 2 ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eCommon Problems It Solves\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eLimited space:\u003c\/strong\u003e the ultra-slim body barely protrudes. \u003cstrong\u003eStrong current in small tanks:\u003c\/strong\u003e its gentle flow suits nano and betta setups. \u003cstrong\u003eTight budgets:\u003c\/strong\u003e effective filtration at a low price. \u003cstrong\u003eCloudy nano water:\u003c\/strong\u003e 3-stage filtration keeps it clear.\u003c\/p\u003e\n\n\u003ch2\u003eSobo WP-308H vs Other Filters\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eSobo WP-308H\u003c\/th\u003e\n\u003cth\u003eSobo WP-408H\u003c\/th\u003e\n\u003cth\u003eSponge filter\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBest tank size\u003c\/td\u003e\n\u003ctd\u003eup to 70 L\u003c\/td\u003e\n\u003ctd\u003eup to 100 L\u003c\/td\u003e\n\u003ctd\u003eup to ~60 L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlow\u003c\/td\u003e\n\u003ctd\u003eGentle\u003c\/td\u003e\n\u003ctd\u003eModerate\u003c\/td\u003e\n\u003ctd\u003eGentle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProfile\u003c\/td\u003e\n\u003ctd\u003eUltra-slim\u003c\/td\u003e\n\u003ctd\u003eSlim\u003c\/td\u003e\n\u003ctd\u003eIn-tank\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrice\u003c\/td\u003e\n\u003ctd\u003eAffordable\u003c\/td\u003e\n\u003ctd\u003eAffordable\u003c\/td\u003e\n\u003ctd\u003eAffordable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eExpert Recommendation\u003c\/h2\u003e\n\u003cp\u003eFor a nano or betta tank where space and gentle flow matter, the Sobo WP-308H is a great budget slim-HOB pick. Add a little \u003ca href=\"\/products\/tcws-bio-media\"\u003eTCWS Bio-Media\u003c\/a\u003e to boost biological capacity, and pair with a \u003ca href=\"\/products\/air-pump-sobo-sb-228-mini-ac-dc\"\u003eSobo air pump\u003c\/a\u003e in warm weather.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat tank size is the Sobo WP-308H suitable for?\u003c\/h3\u003e\n\u003cp\u003eSmall and nano tanks up to about 70 litres — roughly up to a 2 foot aquarium.\u003c\/p\u003e\n\u003ch3\u003eIs the WP-308H a hang-on filter?\u003c\/h3\u003e\n\u003cp\u003eYes — it is an ultra-slim hang-on-back (HOB) filter for the rear rim of the tank.\u003c\/p\u003e\n\u003ch3\u003eIs the WP-308H good for a betta tank?\u003c\/h3\u003e\n\u003cp\u003eYes — its gentle flow suits bettas; baffle the outflow if the current is still too strong.\u003c\/p\u003e\n\u003ch3\u003eWP-308H vs WP-408H — which should I choose?\u003c\/h3\u003e\n\u003cp\u003eChoose the WP-308H for nano tanks up to ~70 L and the WP-408H for small tanks up to ~100 L.\u003c\/p\u003e\n\u003ch3\u003eDoes the WP-308H come with media?\u003c\/h3\u003e\n\u003cp\u003eYes, it includes a filter cartridge; add bio-media such as TCWS Bio-Media for more capacity.\u003c\/p\u003e\n\u003ch3\u003eHow often do I clean the WP-308H?\u003c\/h3\u003e\n\u003cp\u003eRinse the media in old tank water every 2–4 weeks; never under the tap.\u003c\/p\u003e\n\u003ch3\u003eIs the WP-308H quiet?\u003c\/h3\u003e\n\u003cp\u003eYes, when primed and topped up; keep the water level correct so the pump does not run dry.\u003c\/p\u003e\n\u003ch3\u003eCan the WP-308H be the only filter in my tank?\u003c\/h3\u003e\n\u003cp\u003eYes, for nano and small tanks up to about 70 litres it provides complete filtration.\u003c\/p\u003e\n\u003ch3\u003eIs the Sobo WP-308H good for beginners?\u003c\/h3\u003e\n\u003cp\u003eYes — it is simple, affordable and easy to maintain, ideal as a first nano-tank filter.\u003c\/p\u003e\n\u003ch3\u003eIs the WP-308H good value in India?\u003c\/h3\u003e\n\u003cp\u003eYes — it is an affordable, space-saving slim HOB for nano and betta tanks.\u003c\/p\u003e\n\u003ch3\u003eDo I need an air pump with the WP-308H?\u003c\/h3\u003e\n\u003cp\u003eNot usually, but in hot Indian summers an air pump adds extra oxygen.\u003c\/p\u003e\n\n\u003ch2\u003eRelated Products \u0026amp; Guides\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eStep up:\u003c\/strong\u003e \u003ca href=\"\/products\/sobo-slim-filter-wp-408h-hang-on-filter\"\u003eSobo WP-408H\u003c\/a\u003e, \u003ca href=\"\/products\/seachem-tidal-55-hang-on-back-filter\"\u003eSeachem Tidal 55\u003c\/a\u003e. \u003cstrong\u003eTop filter option:\u003c\/strong\u003e \u003ca href=\"\/products\/sobo-aquarium-top-filter-wp-880f-power-15w-f-max-650l-hr-power-aquarium-filter\"\u003eSobo WP-880F\u003c\/a\u003e. \u003cstrong\u003eMedia \u0026amp; aeration:\u003c\/strong\u003e \u003ca href=\"\/products\/tcws-bio-media\"\u003eTCWS Bio-Media\u003c\/a\u003e, \u003ca href=\"\/products\/air-pump-sobo-sb-228-mini-ac-dc\"\u003eSobo air pump\u003c\/a\u003e. \u003cstrong\u003eCollections:\u003c\/strong\u003e \u003ca href=\"\/collections\/aquarium-filter\"\u003eAquarium Filters\u003c\/a\u003e, \u003ca href=\"\/collections\/filters-filtration\"\u003eFilters \u0026amp; Filtration\u003c\/a\u003e. \u003cstrong\u003eGuides:\u003c\/strong\u003e \u003ca href=\"\/blogs\/news\/types-of-aquarium-filters\"\u003eTypes of Aquarium Filters\u003c\/a\u003e, \u003ca href=\"\/blogs\/news\/reduce-filter-flow\"\u003eHow to Reduce Filter Flow\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eConclusion\u003c\/h2\u003e\n\u003cp\u003eThe Sobo WP-308H slim hang-on aquarium filter is a compact, affordable, gentle-flow choice for nano and small tanks up to about 70 litres (up to 2 ft). With an ultra-slim design and simple 3-stage filtration, it keeps nano and betta tanks clear and healthy — one of the best-value small aquarium filters in India.\u003c\/p\u003e","brand":"Fish Bazaar","offers":[{"title":"Default Title","offer_id":44377424920618,"sku":null,"price":2110.0,"currency_code":"INR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0720\/9238\/5322\/files\/515q7JP5FkL._SX522.jpg?v=1779732914","url":"https:\/\/fishbazaarr.in\/products\/sobo-wp-308h-slim-aquarium-filter-power-aquarium-filter","provider":"Fish Bazaar","version":"1.0","type":"link"}