yes, your gourami is indeed a male Dwarf Neon Blue. They do like a lot more plants as they are a bit shy. Also water quality is VERY important, do you test your water? Very regular water changes will be needed in a tank of that size. Don't be tempted to get another male though as they are territorial and your tank is too small to allow. (females are same size but mainly silver and only slight marking) Your corys need a couple more mates of the same as they are happier in a shoal of their own kind. Also they prefer shelter like a small cave or pot on its side. One last thing, don't forget 1" of fish to a gallon of water (rough guide)
Very nice fish though