Beacious, let your mouse cursor linger over the underlined word and the tooltip will pop up explaining what it means. I would prefer tropicals over goldfish any day, I think goldfish are kind of boring in
imo and
ime. For a 55
gal, if your into friendly fish, I would set up a community semi-aggressive, like giant danios, gouramis, scavenger catfish. Or, if you don't mind aggressive fish, a couple of medium sized south american cichlids. Unfortunalty, there aren't many fish that you can put in with goldfish except for other goldfish. As for the 10
gal, if it weren't for owning the goldfish, mollies, platies, small danios, and tetras are nice. Basically anything that doesn't get bigger than 2-3 inches.
www.liveaqaria.com is a nice web site where I turn when I want fish or plant suggestions. I once read that a good rule of thumb for determining the largest fish that you can put in a tank is, take the max lenght of your fish and multiply it by 10. If that number is greater than the lenght of your aquarium, then your fish is too big. I don't know how much I agree, but for the most part it's pretty close.