I'm so sorry for your loss. :(
I know when I lose an animal I tend to go out and get a new one, not to replace the old but to get my mind off it and try to move on. If anything, I'd just go and look...you never know if you will find a special one or one who needs your help.
You are a great fish keeper, and as much as this hurts, accidents do happen. Aquarius was loved and cared for up until his end. His time had come for whatever reason and there's nothing you can do now except remember him for what he was and move on. *hug*