What goes well with 4 Lemon Leleupis in a 36 gal tank?

I have 4 Lemon Leleupis in a 36 bow front tank. Double filtration, pool filter sand (great life hack!), enough base rocks for all of them to have their own crib. Three of the Leleupis are from a brood of the large Leleupi and they all get along well. The hierarchy is well established.

They just seem to hang out an the bottom between the rocks and there is no action in the middle of the tank.

Which small/dwarf African cichlids could I add to the tank? How many?

Thanks

I put 4 socolofis in there. I hope it works out.

Timbo, thanks for the feedback. This morning I fed them Omega One Super Color Cichlid Pellets and they all fed from it. Suggestions?

Thanks, Timbo. This is our first Africans tank and we love the look. After having regular community tanks all my life, I feel like I just got my "yellow belt" in tank keeping.

Update. Added 2 Now White Scolofi, 1 Scolofi, 1 Cobalt, 2 Yellow Labs, and a couple extra base rocks for hiding spots. Tank's doing great. Best tip was to use pool filter sand.