Since you have a bichir already (what kind?) maybe one of your tanks could have a Congo theme. Depending on what kind of bichir you have. I'd suggest a few synodontis multipunctatus like 5 and maybe some Congo tetras or African red eye tetras and a butterfly fish or two. Sandy bottom drift wood and some anubias. As stated in your other thread it's really your preference. Whats in you other tanks currently?