If u want some eggs add a flat slate, big flower pot, or a pvc pipe in there. And In the 1st pic The male is on left and female on right. Males dont have dark patches on their gill plates and have spangles all over and females a have dark patches on gill plates and some spangles all over.
And for the giant danios don't worry if he's agrresive, he won't be able to catch em' thats what they r for.