Ooh you got a little conch in there too? I didn't notice initially from the pictures.
The only thing I would recommend doing is repositioning the corals at the bottom slighty, mainly the large green/orange one and perhaps on of the ones of the left. The conch won't climb up the rocks and if its path is blocked, it won't get to all of your sand bed to clean it.
I had so much muck and crap collected between the rocks and my tank that the hermits or snails weren't cleaning up. As soon as I repositioned the rocks about 1.5-2" from the acrylic, the conch went straight over to it and demolished the lot. Do it at the back of the tank too, ensuring that there is sufficient clearance for its shell. You'll soon see why I called mine "Dyson" lol.