{"product_id":"blue-pet-blh-401-aquarium-hang-on-filter-4-watts","title":"Blue Pet BLH-401 Aquarium Hang on Filter 4 watts","description":"\u003cp\u003e\u003cstrong\u003eThe Blue Pet BLH-401 is a 4W hang-on-back (HOB) aquarium filter delivering up to 250 L\/H, a compact, quiet filter that hangs on the rim to keep small tanks clean while saving space inside the tank.\u003c\/strong\u003e It removes debris, food residue and particles for clear water, creates a gentle oxygenating waterfall, and installs in seconds — a simple, efficient HOB for small community and betta setups.\u003c\/p\u003e\n\u003ch3\u003eWhy choose the Blue Pet BLH-401?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e250 L\/H flow\u003c\/strong\u003e from an efficient 4W motor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHangs on the rim\u003c\/strong\u003e — keeps the tank interior clear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWaterfall return\u003c\/strong\u003e that oxygenates the surface.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical + biological filtration\u003c\/strong\u003e via the cartridge.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuiet and easy to maintain.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eBlue Pet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eBLH-401\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower\u003c\/td\u003e\n\u003ctd\u003e4 watts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax flow\u003c\/td\u003e\n\u003ctd\u003e250 L\/H\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eHang-on-back (HOB) filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eWhich tanks is it best for?\u003c\/h3\u003e\n\u003cp\u003eWith 250 L\/H, the BLH-401 suits small tanks up to roughly 60L. For a smaller option see the \u003ca href=\"\/products\/blue-pet-blh-301-aquarium-hang-on-filter-3-watts\"\u003eBLH-301 (180 L\/H)\u003c\/a\u003e; for more flow, the \u003ca href=\"\/products\/blue-pet-blh-403-aquarium-hang-on-filter-8-watts\"\u003eBLH-403 (500 L\/H)\u003c\/a\u003e. Learn the format in \u003ca href=\"\/blogs\/news\/canister-vs-hob-vs-sponge\"\u003ecanister vs HOB vs sponge\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eHow to set it up\u003c\/h3\u003e\n\u003cp\u003eHang the filter on the back rim, prime it if needed, and plug in. Keep it \u003cstrong\u003erunning 24\/7\u003c\/strong\u003e, and rinse the cartridge in old tank water (never tap water) when flow slows. See \u003ca href=\"\/blogs\/news\/how-to-install-aquarium-filter\"\u003ehow to install an aquarium filter\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eFrequently asked questions\u003c\/h3\u003e\n\u003ch4\u003eWhat size tank is the BLH-401 for?\u003c\/h4\u003e\n\u003cp\u003eSmall tanks up to roughly 60L, based on its 250 L\/H flow.\u003c\/p\u003e\n\u003ch4\u003eDoes it oxygenate the water?\u003c\/h4\u003e\n\u003cp\u003eYes. The waterfall return improves surface oxygen exchange.\u003c\/p\u003e\n\u003ch4\u003eIs it betta-friendly?\u003c\/h4\u003e\n\u003cp\u003eIt is gentle, but if flow is too strong for a betta see \u003ca href=\"\/blogs\/news\/reduce-filter-flow\"\u003ehow to reduce filter flow\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch4\u003eHow do I maintain it?\u003c\/h4\u003e\n\u003cp\u003eRinse the cartridge in old tank water when flow drops, usually every 2–4 weeks.\u003c\/p\u003e\n\u003ch4\u003eShould it run all the time?\u003c\/h4\u003e\n\u003cp\u003eYes, keep it running 24\/7 to protect the beneficial bacteria.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eNew to filtration? Read our \u003ca href=\"\/blogs\/news\/aquarium-filter-guide\"\u003ecomplete aquarium filter guide\u003c\/a\u003e and \u003ca href=\"\/blogs\/news\/types-of-aquarium-filters\"\u003etypes of aquarium filters\u003c\/a\u003e.\u003c\/em\u003e\u003c\/p\u003e","brand":"Onyxaqua","offers":[{"title":"Default Title","offer_id":44484109893674,"sku":null,"price":380.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0720\/9238\/5322\/files\/Blue-Pet-BLH-401-Aquarium-Hang-on-Filter-3.webp?v=1781946824","url":"https:\/\/fishbazaarr.in\/products\/blue-pet-blh-401-aquarium-hang-on-filter-4-watts","provider":"Fish Bazaar","version":"1.0","type":"link"}