I think there are 25+ shells and sand enough to fill a 20 gallon long tank to 2 inches.
I also have 3 large comets (4-5 inches long). You can have them for free if you are interested. Doesn't need to be connected to the cichlid purchase.
I'm near the Reston Town Center.
Neolamprologus multifasciatus, aka multies, are a peaceful shell dwelling cichlid from Lake Tanganyika where adults grow up to 1.5 inches long. https://en.wikipedia.org/wiki/Neolamprologus_multifasciatus