When setting up my Aquatlantis Splendid 120 Ultra aquarium with an Oase BioMaster Thermo 600 filter, I needed a simple way to keep the inlet and outlet pipes neatly organized behind the tank. This aquarium has a lid with two semi-circular cutouts at the back for filter hoses, but I found that the pipes could still shift around or look messy.

This 3D-printed holder keeps both pipes together and aligned, improving stability and appearance behind the aquarium. I originally considered attaching it to the back wall of the tank using double-sided tape (I have a background installed), but the fit is snug enough that the pipes stay securely in place without any adhesive.

It’s a small, non-invasive accessory that helps tidy up filter hose routing for external filters like the BioMaster. Might also work for other tanks or filters with similar hose diameters.