I believe a starfish is to small for a nano.
However - it depends on the size you are looking for, as alot of nano keepers have some that are about an inch long, inch wide and have a bit of bulk on them, and they also have some that are almost flat which are alot smaller.
The reason I have these is because they came with some LR I got off another member on the forum, but I could be wrong so dont quote me on this.
- If you take a quick look on LiveAquaria and check out the starfish they normally give you profile recommendations so that should help, I would look for you but I have to go work now.
YF