Internal Aquarium Filters
Internal Aquarium Filters in India
Internal filters sit fully submerged inside the tank and are the simplest, most affordable way to filter small and medium aquariums. A single unit handles mechanical and biological filtration, runs quietly, and is easy to hide behind hardscape, making internal filters a favourite for nano tanks, betta tanks, shrimp tanks and community setups. Fish Bazaar stocks internal filters from Aquael (ASAP, FAN, PAT), OASE BioPlus, Blue Pet and Sobo, shipped across India.
Choosing an internal filter
- Nano & betta (up to ~75L): Aquael PAT Mini, OASE BioPlus 50, Sobo WP-1050F.
- Community 2–3 ft (up to ~150L): Aquael ASAP, OASE BioPlus 100.
- Larger 3–4 ft (up to ~250L): OASE BioPlus 200, Blue Pet liquid internal filters.
See how internal filters compare in our aquarium filter types compared guide, or learn how to install an aquarium filter.
Frequently asked questions
What is an internal aquarium filter? A compact filter that sits submerged inside the tank, drawing water through a sponge and media cartridge for mechanical and biological filtration, ideal for small and medium tanks.
Are internal filters good for betta and shrimp? Yes, especially models with adjustable flow. For shrimp and fry, pair with a sponge pre-filter to prevent them being drawn in.
Internal vs hang-on-back filter, which is better? Internal filters are cheaper and fully hidden but take up in-tank space; HOB filters hold more media and free up tank volume. For tanks under ~100L either works well.
