Aquarium pump Hagen MARINA POMPKA 200 – model 03961, flow 25–225 L/h

Hagen MARINA POMPKA 200 (model 03961) is a compact aquarium pump designed for small tanks and delicate aquatic environments. With an adjustable flow range of 25–225 L/h, this pump supports gentle circulation, biological filtration and operation of sponge filters. It can be installed internally or externally depending on tank layout and filtration needs, offering quiet performance and adjustable output suitable for planted aquariums, shrimp tanks and small community setups.

Advantages

The pump provides an adjustable flow that allows precise control of water movement from very low to moderate rates, making it adaptable to a variety of small-aquarium applications. Its compact size and quiet operation reduce disturbance to inhabitants while saving space in or around the tank. The unit’s compatibility with sponge filters and biological filtration supports stable water quality by promoting slow, steady circulation. Installation flexibility permits internal or external placement to match individual aquarium designs.

Suitable for

• Small freshwater aquariums and nano tanks
• Planted tanks requiring gentle circulation
• Shrimp tanks and other sensitive invertebrate setups
• Driving sponge filters and small biological filter systems
• Low-flow circulation and water exchange in refugiums or breeding boxes

Key specifications

• Adjustable flow rate: 25–225 L/h
• Compact footprint suitable for internal or external installation
• Low-noise operation designed for minimal disturbance
• Suitable flow range for sponge and biological filtration
• Designed for small-volume aquarium environments

How to use

Mount the pump according to the chosen installation method: place it inside the aquarium on a stable surface or attach it externally as allowed by the tank configuration. Connect the outlet to tubing or directly to the filter media if using a sponge filter. Adjust the flow control to the required rate for your aquarium inhabitants—start at a low flow and increase gradually while observing fish, shrimp and plant responses. Regularly inspect the impeller and intake for debris and clean according to manufacturer guidance to maintain consistent performance.

Usage recommendations

For sensitive species and planted tanks, set the flow below the mid-range and monitor water movement to avoid uprooting plants or stressing invertebrates. Schedule periodic maintenance every few weeks or sooner in heavily stocked tanks to prevent clogging and ensure reliable circulation. When using externally, ensure all connections are secure and free of leaks.