So on Tuesday I'll be getting a hold of a small 4-6 inch Black Arowana. Aside from easily being my favorite fish in the hobby, they are also next to impossible to find where I live. It would be going into the only tank I currently have available, which is my 150 gallon until June when I upgrade to a 300 gallon. My problem is the current inhabitants of my tank. I have a 15-16" Jaguar Cichlid and a 12" Red Devil Cichlid currently residing in there. I've kept arowana with them before and they never bothered them, but they were always 8"+. Do you guys think it would be safe to let the little guy roam free in the tank with those monsters or should I play it safe, buy some eggcrate, and separate them until he gets some size on him?