Key Features Unique Slate ornaments Sits over the centre bubble tube Fits BiOrbs 30L and above Easy to place and move Adds interest to any aquarium Oase biOrb Slate Sculptures add something different and unique to your aquarium. A step away from the well known plants and ornaments, the Slate sculptures add depth and interest the biOrb environment. The ornaments can be placed over the central bubble tube or simply place around the interior of the tank. The slates can be combined with other decorations and plants to create a bold display in any suitably sized aquarium. Specifications Medium Grey Slate : 21cm Medium Grey is suitable for biOrbs 30L and larger, biUbe, biOrb LIFE 30L, 45L and 60L and biOrb FLOW 30L. Can also be used in other aquariums