Lookin' great paul. Watch out for that sand though, as someone has already mentioned that is a pretty deep layer of sand and if it is left un stirred for too long, you're going to get anaerobic activity in there which can lead to pockets of gas that will kill your fish.
If I was you I'd try and take some of the sand out and thin the layer up a bit.
If I was you I'd try and take some of the sand out and thin the layer up a bit.