I think the similarly-shaped danios will school (one of the members here has a glowlight/zebra danio cross), but the CPDs probably won't school with the others because they're MUCH smaller. In general, similarly-shaped fish are the ones that will school (regular neon tetras with gold or black neon tetras, even though the black neons really aren't neons at all; or black skirt tetras with white skirt tetras, since they're both just color variants of the same species).