Hi Tyler,
What is the size of the tank you are keeping this Silver Aro and the potential tank-mates? (I don't know if you have mentioned this somewhere else..)
The fish you want to keep with an Silver Aro is one which can potentially keep up with the growth-rate of the aro and isn't too aggressive.
I keep my Silver Aro with Gars. I have FL and Gator gars, but I only recommending getting FL gars of a size smaller than the Silver Aro. (So if your Aro is 8", the FL Gars can be 5-6".)
I have read that Gars attack "silver fish". But, I have these FL Gars with Silver Aro and 2 Silver Sharks (Bala Sharks) and they have never shown any aggression as of last 6 months.
Good luck,
Sid