Been keeping them together (w/ other fishes) for 5 months now. But my GT is kinda laid back and doesn't bother or terrorize anybody. I guess it depends on their personality.
Alright sick! Well right now they are in a 60 gallon but will be moved to a 250 gallon after they outgrow that. The GT is really not aggressive at all he hides in his Aztec head most of the time so I'm not to worried about him that much anymore. Thank you so much guys!!
I say you're good to go. In general, GT's aren't that aggressive. It may get a bit more aggressive once it gets bigger, but even then, IMHO, it'll likely only get aggro to other cichlids, and your arro should be fine.