That sucks that it died but when they are in a large tank they are less jumpy, I moved my silver from a 75 to a 155 bow he's hanging with the 26" knife and 30" Redtail cat right now and he's happy as a clam takes food from my hand now which he never did in the 75. I've been waiting for my 250gal to arrive for the redtail and knife so I can put the Tiger shovel nose and Peacock in with the silver.
Give the Silver another try but give him his own tank to start and try to socialize him more have a timer to put a tv on and off so he's less jumpy and is use to things that might normally startle him other wise.
Gonzaga