What should I do with this?

[kelp47]

I'm setting up an Octo Lux 60 and so far liking it. But I'm not sure what to do with this little box in the back. It's part the system design. 7.5" x 4.75" and 1.5" tall. I don't really want to keep a deep enough sandbed to cover it, unless the flow happens to drift that way.... Any ideas? Just leave it, or is there something creative I can do?

 

[Spare time]

You can put a little extra sand on that side or put some corals over it. Honestly I think the easiest thing is just put a pinch of extra sand there

 

[Waters]

I think I personally would just stack one or two rocks on it.