- Special underlay for the aquarium & terrarium • Prevents distortion of the glass and levels out uneveness in the base. Instead combine several rocks of the same kind with one or two roots, for example. wide-leafed plants next to fine-leafed ones, light green next to dark green etc. Always set long-stemmed plants in groups. Approximately 2/3 of the floor of the aquarium should be densely planted. • Select fast-growing plants at the beginning to keep algae in check. • JBL SOLAR Tropic fluorescent lamps provide plants with the best light for growth. JBL Denitrol introduces beneficial bacteria to the aquarium from the beginning, biologically breaking down fish excreta. • Stock your aquarium with fish which consume algae from the outset.