Well, it's been in the same tank for 12 hours now. There is zero territorial aggression coming from my cichlids toward the arowana. In fact, my little 2 inch Jaguar cichlid seems to enjoy swimming along side the arowana. The bigger cichlids don't even seem to care that it's there. which to me at this point is good. I'm getting ready to go to bed now, so we'll see how well he left overnight. wish me luck! And here a few pics I just took off the little guy.