Any plastic container can be used for a bio media container (assuming it has appropriate holes in it, of course), at work we use these random containers that are from payless plastics or somewhere similar, the water flows down through them. Another bonus with them is that they're removable, unlike a glass partition in a glass sump would be. As David said 800lph is definitely not enough, the tank will be about 650L and you'll want a 3x turnover per hour minimum. In my 490L tank I've got a 1550lph canister filter and a 500lph internal filter.