NICREW Fish Tank Filter for 20 L aquariums 🐠

This internal aquarium filter from NICREW is designed for small coldwater or tropical tanks up to 20 litres, helping to keep water clear and oxygenated for healthy fish and invertebrates. It combines biological filtration with a removable spray bar that can increase surface agitation, so it is useful for improving aeration and circulation in compact setups.

Key Points

The filter is compact and versatile, suitable for shallow or unusually shaped tanks where space is limited. It can be mounted horizontally or vertically and is submersible, which offers flexibility when arranging equipment in nano aquaria. Five suction cups are supplied for secure attachment to glass or acrylic walls. The removable spray bar allows the unit to function as a gentle surface agitator, a small fountain pump, or a wave maker depending on how it is positioned. Consider that for very high-bioload tanks, additional filtration or more frequent maintenance may be necessary.

Technical Specifications

• Name: NICREW Fish Tank Filter (internal)

• Capacity supported: up to 20 L
• Mounting: horizontal or vertical, submersible
• Accessories: five suction cups, tubing, filter media included
• Colour: black

Benefits

This filter offers effective biological filtration in a small footprint, which helps maintain stable water parameters in nano aquaria. The included media allow beneficial bacteria to colonise, aiding in the nitrogen cycle without taking up much space. Because the spray bar is removable, you can reduce surface disturbance when you want calmer water for timid species or increase flow to improve oxygen exchange when needed. The unit is straightforward to disassemble for cleaning and media replacement, keeping routine maintenance quick and simple.

Practical Tips

For best results position the outlet near the surface to encourage gas exchange, or lower it if a gentler flow is preferred. Replace or rinse mechanical media regularly to prevent clogging and preserve flow, and allow biological media to retain some of the established bacteria when cleaning to avoid disrupting the tank’s cycle. If keeping very small fry or delicate shrimp, consider angling the spray bar away from their main swimming area to reduce current stress. According to the manufacturer, the filter is suitable for both coldwater and tropical setups, but check compatibility with any heaters or other in-tank devices to ensure adequate space.

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