Thanks! I used to be a bit of an enthusiast, especially with coldwater aquarium fish, and at one point African cichlids.

Can you get enough of these that they shimmer in the water?

Probably not with bottom feeders, but white cloud mountain minnows are a freshwater schooling fish that could probably pull that off. They're also tolerant of colder water temperatures, so they'd be appropriate as a pond fish in an area like DC, at least in the warmer months.