For those wanting to know more, THEMUSEUM is a children's museum located in downtown Waterloo, Ontario, and in its main atrium are two tanks for fish, with one on the left holding rainbow fish and the one on the right holding these two fish.
As for the rest of the museum, its mostly standard children's museum affair outside of temporary exhibit halls, so it doesn't really appeal to me, and I wouldn't return to it any other day.
@Great Argus No. They other tank had two yellow fish, and since I know next to squat about fish, I don't know, though website states there are specifically Rainbow Fish.