Lepisosteus platyrhincus;4635639; said:
this is not true. there are people on here that have had. gar like shiney silvery fish. due to feeding responce, and silvery issues as well as other things(im sick, cant think atm) gar are aggressive.
again, just because it works for some doesnt mean its an advisable combo. believe me or not, but when ur gar dies dont come crying to me.
ps, isnt black notorisouly aggressive? hmm, yeah i dont want that with my gar.
Firstly, You are among the most experienced monster fish keepers on..eh.. Monster Fish Keepers

, so my intention is just to learn more about this rather than question your judgement.
Having said that...
I think the primary consideration when keeping Silver Aros with FL Gars is that the relative size of the Silver Aro should always be larger than the Gar so that the Gar don't consider it food.. But still small enough that the Aro doesn't consider the Gar as food.
I can see that in the long run, the growth rate of the FL Gars slows down around 15-16 inches.. but the growth rate of the Silver Aro also slows down around 24 inches.
So, if the Aro is about 6-8 inches larger than the FL Gars (with the Gar being a min of 6-8 inches). This combination might just work..
I have raised mine from 4 inches to 14 inches.. and since they were 6 inches, they have been sharing a tank with a Silver Aro which has always been about 6 inches longer/larger than the Florida Gars. I have NEVER seen any aggression whatsoever between the FL Gars and the Silver Aro.
I concur with that point about Gars attacking Silver fish which they (think they) can swallow. My Gator Gar (~15") tried swallowing a 8" (and fat) Bala Shark. While he could not eat him, he did manage to kill him. So, a smaller silver fish with a Gar is definitely NOT a good idea.
Just my 2 cents,
Sid