An object of the present invention mounted , easy to remove , it is possible to build the aquarium layout outside of the tank , easily , effortlessly , in a short time , old man from beginners , women , even children , and also serves fish , breeding can be decorative member water plants were I to provide a filtration member . A combination of a filtration member 8 internal dimensions to suit is made of plaster and bottom plate base 5 in fall prevention net 9 and the sand - gravel parts of the decorative member was placed on top of the water tank 4 , for the water is turned on I attach the circulation pipe 2 into the insertion hole 7 . [ Selection Figure Figure 1【課題】取り付け、取り外しが容易で、水槽の外で水槽レイアウトを作り上げることができ、簡単、楽に、短時間で、初心者から老人、女性、子供でも、魚、水草を飼育可能な装飾部材を兼ねた濾過部材を提供する。【解決手段】水槽4の内寸に合わせて石膏で製作された底板ベース5に装飾部材の部品の落下防止ネット9と砂・砂利を上部に乗せた濾過部材8とを組み合わせ、水投入用の循環パイプ2を挿入孔7に取りつける。【選択図】図1