Wow, that sure looks beautiful! I bet your fishies are really happy!
However, I'm not sure how big your tank is. If it is a 10 gallon, like I think it is, you're pretty alright on stocking, but right now it doesn't matter. Zebra danios are schooling fish (5 or more in a school) and are so active it honestly is best for them to have a 20 gallon for their room. Your cories should be fine, though you might want to add another one, seeing as they like to be in groups as well.