I think the top zebra danio is a) female and b) gravid. We have 7 longfinned zebra danios, and one shortfinned zebra danio. Thought they were basic black and white striped but really they are now more like gold and purple striped, it's awesome!
The lemon cichlid is also pretty neat, he looks just lemon coloured with a darker orange face but in the sun he flashes a pretty sky blue colour, very electric!
The "golden colouration" dwarf honey gourami. We think this might actually be a female because the stripe is quite dark and prominent (just having looked at pictures online). The long barbels are very expressive, she often touches things with them.