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I've built it! I used 1 IBC container. The top 1/3 of the IBC container was cut and flipped. I filled it with red lava rocks on the bottom half and Hydroton on the top half. After doing more research, I realized more grow bed volume was needed. I made a frame out of some thick cedar and posts and tossed in a pond liner. I used river pebbles on the top half to go the cheaper route. I have just about a 1 to 1 ratio going. The pump is a 550-GPH from Lowes. I have it on a cinder block in case something happens and it will not drain the whole tank. Is it bad that it is not on the bottom? I sp