A surface skimmer is a really useful addition to any external filter

A surface skimmer (JBL TopClean II) is a really useful addition to any external filter, as it keeps the water surface clean and ensures the water above the surface is ideally enriched with oxygen.

【How to Use Laqual Filter】The filter is suitable for a 2-7 gallon fish tank. 1. Before each restart, make sure the filter basket water level is above

LAQUAL 5 Gallon Aquarium Filter with Surface Skimmer, Small Quiet Fish Tank Filter, Biochemical Cotton Filtration & Adjustable Water Flow, Waterfall

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Neo Flow Premium - goodbye standalone surface skimmer?

The Fluval Aquarium Surface Skimmer draws water from the surface of the aquarium eliminating undesirable surface films. Since the Fluval Surface Skimmer doesn't contain metal parts, marine aquariums in particular that do not employ a surface overflow will substantially benefit from the implementation of the Fluval surface skimmer.

Fluval Surface Skimmer

Ahi Hydro Vortex™ Small Waterfall Filter

The easy-to-use SwimSkim is a powerful surface skimmer that floats along the surface of ponds up to 270 ft2 removing debris. The compact SwimSkim easily integrates into an existing pond, automatically adapting to any water level (from 16 in. water depth). The accumulated debris can be easily removed using the leaf basket. Integrated aerator oxygenates your pond while skimming the surface.