Like Davocean said, that guy needs/wants to be in the sand. If it was mine, I would find a spot up against the rocks, with good flow and light, dig a little bit of a hole next to the rock, and try to get it to stay put in the crater you make in the sand. It should start to bury itself into the sand. May need to temporairily turn down the flow while it digs in, which may take a little while. Or you can place rocks around it to try to pin it in place too, but don't smash it with rocks. Don't forget to turn your flow back on once it attaches itself. AND COVER YOUR POWERHEADS WITH FOAM so you don't shred it when you turn your back and walk away.
Messing with nems isn't the best, they do best when left alone, but that guy looks like it needs a little guidance.
Otherwise, looks ok for a new one. Best of luck, I hope it does well for you!