When to add Oscars/Bichirs

Hello all,

I am looking for some thoughts on keeping oscars and bichirs together. I have an empty 300 gallon tank (6'x30"x30") that i'd like to keep some 5 or so oscars and a couple of bichir in but I'm concerned about stocking order. My concerns are that if I get the oscars and bichir together that the oscars will grow way faster and I may have issues with them trying to (or succesfully) eating the bichir. But I am also concerned the other way with getting the bichir first, and then getting small oscars that the bichir may eat the oscars.

Any recommendations here? Also recommendations on type of bichir to do this with?

Thanks in advance.