Any thoughts on keeping more than one Bichir in the same tank? I'm planning a 240g (96x24x25") and was hoping to keep an Ornate and Delhezi together. Is it possible? Any tips for long term success or should I avoid mixing and just get one? Also, could they live long term with a black ghost knife? If these three are possible together, what order should I introduce them and what size to avoid aggression/becoming an expensive meal. Thanks!