I think you should have posted this in the general board as this doesn't have anything to do w/ bottem feeders. Also, more people will look at it.
You substrate is too big for live plants, they will not root properly. Also with the substrate, on the picture with the cory, it is too rough for cories, they should have a soft sandy substrate as they lay on it and you wouldn't want him to get hurt. I would seriously consider changing to a sand substrate.
When you tke pictures of your tank, don't use the flash, it gives it a more natural look when just the aquarium light is on.