#werbung powered by Olibetta the aquaristic online store A quick tutorial on how to build a surface skimmer from an internal filter. I need a relatively strong skimmer for a 2,000 liter aquarium, which is why I once chose an XL version, the Powerline from Eheim: https://www.olibetta.com/eheim/internal-filter-powerline In theory, you can build it with almost any internal filter. The larger the slots, the more slides into them. If you wanna catch duckweed, make it big enough. And if you use the fi