Juwel rock backgrounds can be simply cut to size and attached to the rear of the aquarium from within using juwel silicone adhesiver aquarium number of backgrounds requiredr rekord 60 x 1r rekord 70 x 1r rio 240 x 2r rio 300 x 2r rio 400 x 3r panorama 200 x 2r vision 260 x 2r vision 450 x 3r trigon 190 x 2r trigon 350 x 3