you got it, lots of cover, big tanks, and more than 2. like a lot of fish 2 does not work. 3-5 and they will stake out smaller territories and squabble rather than fight cause they can't afford to get hurt. Almost human?
I have never kept bichirs but have had friends who did. I have kept multiple rope fish and havebeen told they act the same. It has been a while and both bichirs and ropefish have gotten A LOT cheaper. 

