Collection: Underwater Filters

Everything Stays Inside the Aquarium

An internal filter runs fully submerged, with no external canister, no siphon to prime and no hoses crossing the rim. That suits small display tanks, hospital and breeding setups, and any aquarium where cabinet space is short or a plumbing failure would go unnoticed. The cost is volume: the housing occupies water the tank would otherwise hold.

What You Will Find Here

• Submersible power filters in a stepped range of sizes.
• Compact units for nano and desktop aquariums.
• An internal filter with a built-in water-change function.
• Corner filters, including one shaped for fry and very small tanks.
• Replacement parts — extension pieces and suction cups.

Practical Notes

• Check the housing dimensions against the corner you plan to use before ordering.
• Point the return along the front or back glass so the flow stirs the surface without scouring the substrate.
• Wash sponges and cartridges in tank water rather than tap water.
• Replace tired suction cups early — a filter that works loose can stir up the substrate overnight.