It's really pretty, but I have to say, Cories should be in at least 10 gallons, preferably with a wide bottom. That isn't enough surface area for them to forage, and the gravel looks rough.
Cories prefer a softer substrate because they burrow and dig around with their whiskers. They also require at least ten gallons and should be in groups of 5 or more, with 4 being probably the lowest you could go. Sorry :/
Thanks for the complements on the tank.
Sweeda88 and turtle10 thanks for the tip about the cory's, I can't do much about the tank size, the bottom is 12x12. However I'll find some finner substrate.