cinnamon clowns tankmate suggestions

I have 2 cinnamon clowns in my 29 gal nanocube its been up and running for about 3 months. I let it cycle with 0 fish only sand,rock, and a few softies for the whole time meanwhile breeding copepods and amphipods with nothing in it too eat them so it has a pretty good abundance of them at this point. My question is I just added 2 baby cinnamon clowns, I know they can be very territorial and agressive toward other fish, so what would be 1 good tankmate for them any ideas are appreciated, and thanks in advance.