Refer to yesterday's post....someone also mentioned that his silver aro is not eating at all and there were many opinions given by fellow members. Maybe u can pick up a tip or two from there.
I Say check water parameters first, then try some live food (not too much) and try moving to cut raw shrimp. In my experience silvers usually have a very good appetite and should even take pellets readily.
I have had a few when they are small and you cant get them to feed I used to get a hypodermic needle and inject a small amount of air into a worm I think you call them night crawlers (just a small one). This causes it to float and also wriggle around like mad this worked in 90% of situations and got them to feed.