I've really enjoyed cherry barbs, harlequins and dwarf neon rainbowfish.
Suggestion: get a school of 5, 6 of one of the smaller types of fish
(harlequins or cherry barbs) and see how things go.

Also, is the aquarium pretty well cycled? Perhaps get 2 or 3 cherry
barbs now, and 3 or 4 more in 3-4 weeks?
Thanks for the well wishes. I am filing everyone's suggestions and
thoughts.
I will see how the tank cycles for a couple of weeks. I took the blue
filter pad from my cycled penguin mini and put it in the extra space
in the penguin 100, and I am floating the biowheel from the mini in
the tank. So I guess I will know if that is successful over the next
week or so. If so I will then hit the store again.
Right now my thoughts are.... well, actually they change every 15
minutes on what I "think I will get". Leaning towards cherry barbs
and harlequins, but by the time I am done typing it may be something
else from that list. Then, once I get up to That Fish Place in
Lancaster, who knows what the heck will happen :-)
Teri