It is a good depth for the back of the tank, if you wanted you could make it an inch and half towards the front and then deeper in the back. That is what I've done in most of the newer tanks, the older tanks started out deep all the way across just because i didn't know better and didn't care what it looked like when we first started. I think it looks good, the color of safetsorb is really pretty and your plants look awesome!!
How do you like the contortionist vallisneria? I don't have any of this yet and have been looking at it, I love the way it looks so if it grows out for you maybe we could trade some plants!