Corys like water movement. If you look on youtube you'll see them in their natural habitat, which is shallow fast moving streams. My corys love the movement of the water at night after the lights are out and I have the air stones going. They have a ball playing in the current.
A couple of things that strike me with your set up. First off, it looks pretty good. You have the idea. I think someone mentioned varying the size of the rocks. I think that would be ideal.
Is this a 10 gallon tank? If so I would stop stocking any more fish until the ones you have create equilibrium with the biological filter as you cycle the tank. Adding more fish right now might be risky. I wouldn't do it. If it is indeed a 10 gallon you might already have the max load your filter can handle.
I noticed in the first few pix that you had your tank sitting on a piece of wicker furniture. I can't tell whether it's still on that furniture or whether you moved it, but I would be very careful if you're still using it. Wicker isn't known for it's stability and the flex might be disastrous. If you put something underneath the tank like a piece of 1/2" plywood or MDF then you might be ok as long as there's no lateral movement.
Nice start! Good luck!