The Juwel protein skimmer 3.0 is recommend for marine Juwel upgrades, as well as to fishkeepers who want to add a skimmer to their new or existing Juwel without modifying the tank. The new skimmer makes upgrading a Juwel for marine use very easy and does so without damaging the aquarium. It is internal unit with similar dimensions to the Juwel internal filter and is designed to sit in the opposite corner of the aquarium attached to the rear and side glass. The Juwel Skimmer 3.0 come complete with a special mount which is siliconed into position providing a secure fit.