Pair of onyx percula need a home. Which nem in your opinion?

[spscrackhead]

Hey guys, just rcently got a beautiful pair of onyx perculas for my 175 mixed but sps dominant tank. I would like to have them host a nem and was looking for opinions.
The tank is fairly stocked at this point so a wanderer isn't something I am really after. Looking for input and suggestions.
It is my understanding percs prefer sand dwelling nems? That would be ideal for my tank as well.

 

[davocean]

Natural match's would be magnifica, gigantea, or H.crispa, crispa being the only kinda sand dwellar, but will be at base of rock and all 3 get so big that they will most likely be against if not on rockwork.

Sometimes they take to non natural hosts, LTA/doreensis or malu are both sand dwellars, malu being the smallest and usually bright colors, if you don't go natural that would be my pic.