Hey there, I would consider Rocket Killifish and Celestial Pearl Danios if you have not yet. Rocket Killifish do not prey on their fry so might be rewarding to get a group of them together and let them colony breed in their own 10g with some moss. Feed them hatched baby brine shrimp and sit back and enjoy. I would start with one or two trios (1M2F) in a 10. As for CPD's they are egg scattering so if you place them in the 10 for a week while feeding live baby brine and then remove them, you should see teeny fry in a week or so. Both projects I have done in the past and found to be really rewarding.
SJ