ime I treat my wyckii like an aggressive cichlid. if its been housed alone all its life then you probably have no chance. I know my wyckii isn't as aggressive or large growing as artc but going on my experience with mine I would get a young one if I were going to attempt it with an artc, under 12 inch and make sure its in with some big bull cichlids that will keep it in check, with the eventual size you don't have much choice... maybe a big butti, dovii, umbee but it could always end in a bloodbath.... risky game comming aggressive species as we all know.
also do I need to say it, tank size is everything... in a few thousand gallons an artc could easily be very mellow.