GL with the new aro. I just backread on this thread and somehow learned about silvers being prone to DE, that sucks. Hope your black doesn't develop DE/jump/have another freak accident. I'm fairly new to the hobby(just started fishkeeping last August 2012), but we managed to, maybe not a show-type aro, but we did manage to raise 1 silver and 1 rtg(both are doing fine inside 1 tank[knock on wood]), we did have a casualty though, a banjar aro which died to an unknown disease... As for jumping aros, the silver is approximately 11~14inches now and is skittish as hell, jumps all the time, but what I did was to put the water on a high level and place a 1/4" glass as cover. Well anyways, enough with my short exp, just wanted to share a bit. .
... And good luck, again!