Yes, Endlers livebearers benefit from a filtration system in their aquarium. A filter helps maintain water quality by removing toxins and debris, ensuring a healthy and stable environment for the fish. It also provides oxygenation, which is crucial for their well-being. When choosing a filter, opt for one suitable for the size of your tank and consider a sponge or low-flow filter to prevent strong currents, which can stress these small fish. Regular filter maintenance is essential to keep the water clean and the fish thriving.