1. What species do you recommend? I'd like a colorful species that doesn't grow very large, specifically, frogs about an inch long fully grown would be excellent. I'd like them to be diurnal, but I'd also like frogs that sing at night, (frogsong would go well with the cricketsong already permeating my home on account of the bearded dragon) but I don't know if I can have it both ways.
Red eyed tree frogs are a great singing smaller frog. Also, there are pacmans and pixies that everyone loves!

The rest, I don't know.