Oh!? You saw my post. I don't recognise your username, sorry. Yeah, could work, but full grown GT is hard to find here, at best I could find was 5 inches, now I have around 5 GTs, but I haven't bought any silver aro yet.GT can be hit or miss. The questions you are asking pertaining to certain fish if X fish will get along with Z fish is impossible to answer some people have had GTs with Aros and it works fine others will tell you GT attacked Aro, and other group will tell you Aro attacked GT.
If i remember dont you have or building 50K pond? if so the Aro and GT will probably never cross paths