The aro, the bichir and the royal pleco are all doing fine in a 90 gallon now. The silver is less than 5 inches big, will be in a 225 by may and when the time comes, will be in a custom built tank (uncle works with glass...easy to make a tank).
I try to do the most research possible before purchasing a fish, but it's always good to have someone else who's had personal experience give their opinions as well. Right now the 90 looks so severly understocked that's its not funny. But I know that won't last long LOL.
The bichir ate well last night and is actively moving around the whole bottom of the tank.